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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. WalkthroughVerbose-fetch curl output and audit fix hints now shell-quote command arguments. Curl output conditionally adds ChangesShell-safe command arguments
Suggested reviewers: Priority: ⬆️ High Merge Risk: ⚪ Minimal · up to The verbose fetch curl command and the audit ignore hints are now quoted so a POSIX shell treats them as plain arguments. Pasting them no longer runs embedded shell substitutions. No known blocking issue remains. Compatibility limits for some non-POSIX shells are documented. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Updated 6:22 AM PT - Oct 3rd, 2026
❌ @autofix-ci[bot], your commit f6db1bd has 1 failures in
🧪 To try this PR locally: bunx bun-pr 41726That installs a local version of the PR into your bun-41726 --bun |
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Status: ready for review. A pasted curl command runs commands on bun 1.4.3 and on main: cat > t.mjs <<'X'
using s = Bun.serve({ port: 0, fetch: () => new Response("ok") });
await fetch(s.url, { headers: { "x-note": "$(touch /tmp/ran-from-header)" } }).then(r => r.text());
X
BUN_CONFIG_VERBOSE_FETCH=curl NO_COLOR=1 bun t.mjs 2>&1 | grep '^curl' > cmd.sh
sh cmd.sh; ls /tmp/ran-from-header
# before: the file exists, because the shell ran touch. after: no such file.
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked that the wire serializer is unaffected — Headers Display (src/picohttp/lib.rs:620) still writes header.value() directly, and the new test's expect(stdout).toBe("Bearer ${secrets.authorization}\n") proves the server received the real token. The single-Header Display impl is only reached from the verbose-trace printers.
Extended reasoning...
The main correctness risk with moving redaction into Header's Display impl would be accidentally redacting the on-wire request itself. I verified this is not the case: the HTTP/1 request writer uses the separate Headers<'_> Display impl at src/picohttp/lib.rs:620-632, which formats BStr::new(header.value()) directly and never goes through logged_value(). The new test independently confirms this by asserting the child's stdout is the unredacted Bearer auth-sekret echoed back from the local server. The two inline findings (docs under-describing what redacted_npm_url masks, and the hand-rolled matches duplicating strings::eql_any_case_insensitive_ascii) stand on their own; nothing further to add.
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Inline comments:
In `@src/picohttp/lib.rs`:
- Line 176: Update the header formatting paths, including Header::fmt and the
fallback around name, so folded continuation lines cannot expose sensitive
header values; track the preceding header’s sensitivity or redact all
continuations consistently with logged_value(). Add response regressions
covering raw folded Set-Cookie and Authorization headers.
In `@test/js/web/fetch/fetch.test.ts`:
- Line 3653: Replace the for...of mode loop with a describe.each matrix over
["1", "curl"], naming each suite BUN_CONFIG_VERBOSE_FETCH=%s and passing mode
into the existing test body without changing its behavior.
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LGTM — the per-line header assertions in ec08f92 now check Cookie and Set-Cookie independently, which was the last open point.
Confirmed the wire serializer (Display for Headers, src/picohttp/lib.rs:611) still writes header.value() raw, so redaction is confined to the trace/curl output; the old inline redaction in print_request is deleted; docs now enumerate everything redacted_npm_url masks.
Extended reasoning...
Overview
The PR centralizes credential redaction for BUN_CONFIG_VERBOSE_FETCH output by adding Header::logged_value() in src/picohttp/lib.rs and routing Display for Header, HeaderCurlFormatter, and RequestCurlFormatter's URL through it (and redacted_npm_url). The per-callsite redaction in src/http/lib.rs:print_request is removed. Coverage now includes Cookie, Set-Cookie, and x-amz-security-token in addition to the two auth headers, and applies to the > request lines, < response lines, and the emitted curl command. A docs paragraph and a two-mode test suite in fetch.test.ts accompany the change.
Security risks
None introduced. This is a hardening change to debug/trace output — it strictly reduces credential exposure in logs. The critical correctness question was whether Display for Header is reachable from the wire serializer; I re-verified that Display for Headers<'_> (the request serializer at src/picohttp/lib.rs:611-623) still writes BStr::new(header.value()) directly and is untouched, so real HTTP requests carry the unredacted values. No auth, crypto, or permission logic is modified.
Level of scrutiny
Moderate. The diff is small (~120 lines), mechanical, and follows the REVIEW.md guidance of moving a guard into the shared helper so all three printers (request trace, response trace, curl line) get it, then deleting the superseded per-callsite copy. I have reviewed three prior pushes of this PR; each round's feedback (docs completeness on URL masking, using eql_any_case_insensitive_ascii instead of a hand-rolled loop, and independent Cookie/Set-Cookie assertions) was addressed in the subsequent commit.
Other factors
Tests follow harness conventions: port: 0, bunExe()/bunEnv spread, await using, Promise.all draining pipes, exit-code asserted last, describe.concurrent, CRLF-safe line splitting, and both BUN_CONFIG_VERBOSE_FETCH=1 and =curl covered with positive (redacted lines present) and negative (raw secrets absent) checks plus a non-redacted control header. No outstanding third-party CHANGES_REQUESTED reviews; the two github-actions inline comments were followed by a6af527 (doc-comment trimming). Exit reason was dry_streak.
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On the folded-header finding: that path is not reachable through the trace today. bd427bc still makes the printer fail safe: a nameless continuation line now prints as |
…ponse log BUN_CONFIG_VERBOSE_FETCH=curl printed Authorization and Proxy-Authorization raw, one line above the redacted request block. Cookie, Set-Cookie and x-amz-security-token were printed raw in both modes, and the curl line carried the URL password. Move the redaction into one formatter on picohttp::Header. Every verbose printer (the > and < header lines and the curl line) uses it. The curl line masks the URL the same way the request line does.
…rything the URL masks
…each over the two modes
bd427bc to
bfa137a
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Rebased onto main bf42a52 for a fresh CI run (was bd427bc, now bfa137a). There was no conflict and the diff is unchanged: the added and removed lines are the same as before. Checked on a local debug build of bf42a52 with this branch and 12 other rebased branches merged in: the 2 |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked that routing redaction through Header's Display cannot reach the wire: the on-wire serializer is the separate Headers formatter in src/picohttp/lib.rs (still writes header.value() raw), and every {}/.curl() use of Header resolves to print_request/print_response (including the h2/h3 callers), so only the trace output changes.
Extended reasoning...
The change moves verbose-fetch credential redaction from print_request in src/http/lib.rs into a LoggedHeaderValue Display adapter in src/picohttp/lib.rs, extends it to Cookie/Set-Cookie/x-amz-security-token, routes the curl -H flags and response lines through it, and wraps the curl URL in redacted_npm_url; it touches credential exposure in debug logging. The prior nits (duplicate matches helper, docs enumeration of UUID/npm-token masking, Cookie vs Set-Cookie assertion overlap) are addressed in the current code. Two confirmed findings on the URL redaction at src/picohttp/lib.rs:390 are posted inline, so approval is not appropriate.
The curl line used redacted_npm_url, which also prints every UUID as `***`. A UUID in a fetch URL is usually a resource id, and the command no longer ran for such a URL. Add redacted_url_credentials, which masks the password and npm tokens and keeps a UUID, and use it for the curl line. The > request line is unchanged.
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Actionable comments posted: 1
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @docs/runtime/debugger.mdx:
- Line 172: Update the credential-redaction paragraph to say “Selected
credentials are redacted.” Explicitly warn that custom credential headers and
arbitrary query-string tokens remain visible, while retaining the existing
warning that the request body is printed in full.
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Code review found no new issues
No new issues were found in this update; 1 finding from earlier reviews is still open above.
Still open from earlier reviews (1):
- 🔴
src/picohttp/lib.rs:174—Maintainers building this branch likely get a hard build error in bun_picohttp, so nothing in the PR ships. src/picohtt…
If you have decided not to act on one of these findings, resolve its thread (a reply alone leaves it open) and the next review stops counting it. To review this commit again now, use Re-run on its "Claude Code Review" check.
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This pull request is back in draft. Do not merge the current head (934c9cf). A review of my own diff found that the redaction in this pull request reverses two decisions that are recorded on #37669:
I did not find these replies before I opened this pull request. The body calls the raw curl line a gap. That is wrong: it is a choice. The next push removes the redaction. The pull request then holds one change that agrees with those decisions: the arguments of the printed curl command are quoted for a POSIX shell, and the values stay as they are. Today the values are in double quotes, so a pasted command runs The three credential shapes that were asked for in this pull request (a URL user name with no password, a password in a |
The curl line prints credentials on purpose, so that the command can be pasted and re-run as-is. On the header lines only Authorization and Proxy-Authorization are masked on purpose. Both choices are recorded in the review replies on #37669. This puts the five files back to their state on main.
BUN_CONFIG_VERBOSE_FETCH=curl prints a command to paste and re-run. Its
values were inside double quotes with no escaping, so a POSIX shell
expanded $(...), backticks and $VAR in a header value, in a body and in
the URL. The URL of a redirected request comes from the server.
On POSIX builds each argument is now one word in single quotes
(quote_posix_shell in bun_core::fmt), with '\'' for a quote. The body is
printed as it was sent, not as a JSON string. The values do not change,
credentials included. curl gets --globoff when the URL has [ ] { }.
Windows keeps the double-quote form.
…babd73/verbose-fetch-curl-redaction
…words bun_core::fmt::shell_word replaces quote_posix_shell. It writes bytes as one argument that a POSIX shell passes unchanged and that fish and PowerShell cannot run: - letters, digits and '-' only: as is - a control character or a byte that is not UTF-8: one $'...' word, all ASCII, so the command stays on one line and a GBK or Big5 shell cannot pair a byte with the backslash of the next escape - else '...' runs, with ' and U+2018..U+201B in "..." and a backslash in front of a backslash or a quote outside the quotes The curl line uses it for the URL, the method, each -H and the body on every platform. A body with a NUL byte is not printed. bun audit fix prints each --ignore token through it, and ignore_token returns the GHSA id instead of the rest of the advisory URL.
robobun
changed the title
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Head moved: 934c9cf to d57cddc. Three commits on top, no rebase and no force push.
The title and the body are rewritten for this. The reasons are in my comment above. |
…://github.com/oven-sh/bun into robobun/09babd73/verbose-fetch-curl-redaction # Conflicts: # src/bun_core/fmt.rs
robobun
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Beyond the inline findings, two things I checked and ruled out: the fmt::Error fallback in shell_word_utf8 is unreachable from ShellWordQuoted (that branch runs only when every part is valid UTF-8, and every cut point is an ASCII byte or the full 3-byte U+2018..U+201B sequence), and the $'...' branch only slices between ASCII bytes. The iter().position(..) in ignore_token is a character-class predicate (is_ascii_alphanumeric() || '-'), not a byte-literal compare, so it is outside what byte-search.test.ts and clippy.toml deny and has no bun_core::strings equivalent to use instead.
Extended reasoning...
The change adds a shell-quoting Display formatter in bun_core and routes the verbose-fetch curl line and the bun audit fix --ignore hint through it, which is a shell-injection surface fed by server-chosen URLs, headers, bodies and advisory ids. Confirmed findings are posted inline, so this note only records the UTF-8 boundary and byte-search-lint checks that were examined and found clean.
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| let request = self.request; | ||
| let url = [request.path]; | ||
| let url = shell_word(&url); |
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🔴 Windows users who paste the printed curl line into cmd.exe can now run server-chosen text, which the base's "..." form did not. src/picohttp/lib.rs:350 prints every argument through shell_word, whose '...' form (src/bun_core/fmt.rs:3401) is not a quote in cmd.exe, so a redirect to /x?a=1&calc prints 'http://h/x?a=1&calc' and cmd.exe runs calc after curl; every plain ?a=1&b=2 URL also stops replaying there. Fix: on Windows builds emit a form cmd.exe reads as one word for & | < > ^ in URL, header and body (e.g. a cfg(windows) branch keeping the base "..." quoting with " escaped). The PR text says Windows keeps "..."; the code does not.
Why this was flagged
Trigger: a Windows user runs with BUN_CONFIG_VERBOSE_FETCH=curl, a server answers a redirect whose Location query holds & (any ?a=1&b=2 URL also qualifies), and the user pastes the printed line into cmd.exe. src/http/lib.rs:1376 prints request_.curl(...) on every platform; RequestCurlFormatter::fmt at src/picohttp/lib.rs:349-350 goes through shell_word, which has no platform branch (src/bun_core/fmt.rs:3372-3410) and emits '...' for any word with a non-alphanumeric byte. cmd.exe does not treat ' as a quote and splits an unquoted line at &; so curl --http1.1 'http://h/x?a=1&calc' runs curl and then calc'. On the base branch (removed lines at src/picohttp/lib.rs:360 curl --http1.1 "{}") the URL sat inside "...", which cmd.exe does honour, and the WHATWG parser percent-encodes " in a URL, so the server-chosen URL could not break out there. The docs paragraph at docs/runtime/debugger.mdx:172 only tells users not to paste into cmd.exe; nothing in the code prevents the Windows build from printing the POSIX form.
Verification: src/http/lib.rs:1376 runs on every platform; src/picohttp/lib.rs:350 let url = shell_word(&url) emits 'http://h/x?a=1&b=2', and there is no cfg(windows) in src/picohttp/lib.rs or around ShellWord in src/bun_core/fmt.rs:3367-3410. cmd.exe does not recognize ' as a quote, so & splits the line. On the base the same URL printed as "http://h/x?a=1&b=2", so the replay worked.
| // Not `'\''`: PowerShell leaves the text after it outside any string. | ||
| self.enter(ShellWordIn::Double)?; |
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🟣 pre-existing, not blocking: Users who paste the curl line into an interactive bash whose history scanner does not track double quotes (the 3.2 and 4.x series) get event not found or history text spliced into the argument when a value holds ' and a later !. A ' is written as a bare "'" run at src/bun_core/fmt.rs:3509; that scanner takes the '"' as a single-quoted string, so the following '...' run is read unquoted and !x inside it is expanded. Fix: keep every ! inside quoting that interactive bash of every version honours, e.g. write ' as \' outside quotes ('it'\''s', also right for zsh, dash and fish) or document the PowerShell trade-off; the paste test runs bash with --norc non-interactively, so history expansion is never exercised.
A small fix can ride a push you are already making; otherwise a short reply is enough.
Why this was flagged
Trigger: a value the server or request chooses holds a ' and, later in the same word, a ! (URL path, header value or body), printed under BUN_CONFIG_VERBOSE_FETCH=curl via print_request at src/http/lib.rs:1376 and shell_word. ShellWordQuoted::part at src/bun_core/fmt.rs:3505-3511 emits the ' as "'" between two '...' runs, giving 'a'"'"'b!x'. In interactive bash releases where histexpand only skips single-quoted strings and does not toggle a double-quote state before doing so, the scanner treats '"' as the quoted string and then sees !x outside any quote: !x fails with bash: !x: event not found or splices the previous command text into the argument before the shell parses the line. On the base branch every value sat in "...", so any ! was expanded in all bash versions; the change narrows but does not close the gap. The test at test/js/web/fetch/fetch.test.ts:4345-4359 runs bash --norc --noprofile on a script, where history expansion is off, so it cannot observe this.
Verification: Triggers only in an interactive bash whose history scanner skips single-quoted strings but does not track double quotes, with a word holding ' then !. ShellWordQuoted::part in src/bun_core/fmt.rs writes ' as "'", so a'b!x becomes 'a'"'"'b!x' and !x is expanded. On the base branch "a'b!x" also expanded !x. The paste test spawns bash non-interactively, where histexpand is off.
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Problem
fetch(url, { verbose: "curl" })andBUN_CONFIG_VERBOSE_FETCH=curlprint acurlcommand to paste. Its values are inside"..."with no escaping (RequestCurlFormatter,HeaderCurlFormatter,src/picohttp/lib.rs). A pasted line runs$( )from a header, a body, or a redirect URL.bun audit fixprints--ignore <token>with the registry's text as it came (src/install/audit_fix.rs).GHSA-x;touch${IFS}PWNEDrunstouch.Fix
bun_core::fmt::shell_wordwrites bytes as one shell argument. The curl line uses it for every value, on every platform. The audit line uses it for each token.ignore_tokenreturns the GHSA id, not the rest of the advisory URL.fetch.test.ts -t "curl line"(pastes the lines into each POSIX shell found),bun-audit.test.ts,12042.test.ts.Background
-print as is. A control character or a non-UTF-8 byte makes one all-ASCII$'...'word, so the command stays on one line. Other words are'...'.'\'': a command still ran in fish (4 of 62 strings) and PowerShell (19 of 62).Downsides
cmd.exehas no single quotes: the command does not work there. Before, it worked when no value held a".$'...': 334 of 1288 test lines arrive with other bytes. PowerShell changes a word that holds a'. No command runs.Notes
History of this pull request
Authorization/Proxy-Authorizationare masked on the>lines (Robustness and input-handling pass across install, shell, TLS/QUIC, HTTP/3, SQL and crypto #37669 (comment)). 40225c1 removed the redaction.quote_posix_shell('...'with'\'') on POSIX builds and left Windows on the"..."form. It added--globofffor a URL with[ ] { }.--globoff.shell_wordreplacesquote_posix_shell, on every platform. New: thebun audit fix --ignoreline and the GHSA id cut inignore_token.'\''is exact in sh and bash. In fish a value with a backslash in front of a quote still ran a command (4 of 62 strings), in PowerShell 19 of 62. A body with a line feed printed as several lines, and ESC or CR went to the terminal as they are. A Latin-1 header value printed as U+FFFD. The earlier$'...'attempt that let dash run a command used\'inside. This one writes\047, so dash finds no quote inside.The forms, and the shell each rule is for
'...'for a run of text. A POSIX shell reads it as data.'goes into a"..."segment of its own ('it'"'"'s'). With'\'', PowerShell leaves the text after the quote outside any string."..."segment. PowerShell ends a'...'string at these typographic quotes.\\. fish reads\\and\'inside'...'as escapes.$'...'with\\ \n \r \tand 3-digit octal escapes. Every byte above~and every'is octal there. So the word is ASCII: a shell in a GBK, Big5 or Shift-JIS locale cannot pair a raw byte with the backslash of the next escape. dash, fish and PowerShell read$'...'as$and'...', and find no quote inside.-only is printed without quotes. A normal--ignore GHSA-xxxx-xxxx-xxxxline does not change.Measured
Paste fuzz with the debug binary of the first revision of this change (the same encoder, but the URL then went through the redaction formatter that is now removed). 1288 requests (88 chosen, 1200 random from a seeded generator), 3697 data words (URL, one header, body), 352 lines with a
$'...'word. Each printed line was run with a stand-incurlthat records its arguments.$'...'word)', and pwsh splits such a word)The same 62 strings in other forms, one word each: the old
"..."form ran a command for 9 strings in bash and dash, 6 in fish, 7 in pwsh.'\'': 0 in bash and dash, 4 in fish, 19 in pwsh.'"'"'alone: 1 in fish, 4 in pwsh. The Chrome DevTools form ($'...'with\'): 3 in dash, 18 in pwsh.Length of the printed line: the docs example is 298 B before and 294 B after. A 65,565 B pretty-printed JSON body: 81,443 B before and 71,384 B after, one line in both.
bun-audit.test.ts: 183 pass. None of the existing--ignoresnapshots changed.Cost for a request without the trace: nothing. The three callers of
print_requestare behindverbose != HTTPVerboseLevel::Noneand this change does not touch them. On a release build of the base formatting, gdb counted 0 calls ofprint_requestfor 200 requests without the trace.Allocations in the trace: gdb counted 0 allocator calls inside
print_requeston the base formatting. The new code has noVec,StringorBox. Not counted again on the new code.Not measured: the size of the release binary and instruction counts. Two release builds did not finish on the build host (load average above 1500 for hours), and valgrind, perf and strace are not installed there. By reading: the change adds one
Displayimpl with three helper functions inbun_core, and the curl formatter no longer calls the JSON string printer.Not covered
cmd.exe. A line for it needs another quoting (^,%), and one line cannot servecmd.exeand PowerShell.'and later a!: its history scanner does not know"...", so it can reportevent not found. The line does not run in that case. bash 5.2 with history expansion on is in the table.bun add --catalog,bun update --filter,bun patch,bun pm diff, thebun runlist,bun create. They can callshell_wordlater.-H 'name'for a header with an empty value sends nothing, and--http1.1is printed for HTTP/2 and HTTP/3 requests.no published version fixeslist (not a command).Other pull requests on these lines
>and<lines are.>prefixes) and test: make 12042.test.ts exit cleanly under LeakSanitizer and tighten its assertions #37479 (12042.test.ts) need a rebase after this one.Suites run
fetch.test.ts -t "verbose fetch"(4 pass),test/regression/issue/12042.test.ts,bun-audit.test.ts(the new case and the two existing--ignorecases. All 183 passed on the first revision of the audit change),test/internal/source-lints/byte-search.test.ts. The last commit after that run changes comments only (cargo checkpasses).--globoffcase,12042.test.tsand the new audit case fail.Tests
fetch.test.ts: the exact word for 16 bodies, a body with a NUL, a Latin-1 header, a credential header, and the paste test (sh, bash, zsh, dash where found). On 1.4.3 the paste test fails with commands run by the shell.12042.test.tschecks the new quoting.bun-audit.test.ts: an advisory URL with shell text after the GHSA id, and a string id with spaces. The test pastes the printed line intosh, and runsbun audit fixwith the printed tokens.no test proof · iteration 3 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/web/fetch/fetch.test.ts