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[Security] Time out DeepSeek tool-call regexes - #55473
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WalkthroughDeepSeek V3 and V3.1 tool parsers now apply the configured regex timeout during full and streaming extraction. Full extraction preserves content after a timeout. Streaming extraction stops processing later deltas after a timeout. Tests cover both parsers. ChangesDeepSeek regex timeout handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk:
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The title clearly and concisely identifies the main change: adding timeouts to DeepSeek tool-call regexes. |
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The description directly explains the timeout changes, affected parsers, error handling, streaming behavior, and test coverage. |
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Inline comments:
In `@vllm/tool_parsers/deepseekv31_tool_parser.py`:
- Around line 409-411: Prevent repeated regex attempts after a streaming timeout
in both DeepSeek V3.1 and V3 handlers: update the TimeoutError path near the
existing warning in vllm/tool_parsers/deepseekv31_tool_parser.py lines 409-411
and vllm/tool_parsers/deepseekv3_tool_parser.py lines 412-414 to record terminal
timeout state or enforce a bounded total regex budget, so later deltas skip
matching. Add two-delta regression coverage for both parsers, forcing match to
raise TimeoutError and asserting the second delta does not initiate another
timed match.
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tests/tool_parsers/test_deepseekv31_tool_parser.pytests/tool_parsers/test_deepseekv3_tool_parser.pyvllm/tool_parsers/deepseekv31_tool_parser.pyvllm/tool_parsers/deepseekv3_tool_parser.py
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Verified locally (head 33de2fa vs base bc96d76) — the vulnerability is real, the fix is correct and complete.
DoS reproduced (live, actual compiled patterns + real parser class): the deepseek_v3 tool_call_regex is a nested-.* pattern whose findall exhibits quadratic backtracking on adversarial output that passes the <｜tool▁calls▁begin｜> sanity gate but contains many <｜tool▁sep｜> tokens with no terminating `
````json``` structure. Measured on the real parser:
- 520 KB adversarial completion: BASE (no timeout) = 11.6 s event-loop stall, 0 matches; HEAD (timeout=1, the env default) returns in 1.00 s with
TimeoutErrorcaught,tools_called=False, and the full content preserved (fail-soft — no tool call fabricated, nothing dropped from the assistant message). - Growth is clearly quadratic (30k seps → 6.4 s, 50k → 17.8 s unbounded), so larger pathological completions stall proportionally longer — the API-server event loop is blocked for the whole duration on the un-fixed code.
Coverage is complete: all 3 regex call sites in each parser carry timeout=envs.VLLM_TOOL_PARSE_REGEX_TIMEOUT_SECONDS — non-streaming tool_call_regex.findall (extract_tool_calls), streaming stream_tool_call_portion_regex.match, and the stream_tool_call_name_regex.match fallback (deepseekv3: :99/:268/:278; deepseekv31: :96/:265/:275). Both parsers add except TimeoutError in the non-streaming (→ content-only result) and streaming (→ skip delta) paths. Env var already exists (default 1 s, int) and is used identically by 5 sibling parsers (llama, pythonic, olmo3, lfm2, llama4_pythonic) — the deepseek pair was simply missed; no new config surface.
Tests: 6/6 new timeout tests pass at head (mock-asserting the timeout= kwarg is forwarded and that TimeoutError degrades fail-soft / skips the delta in both parsers). Teardown "errors" are the standard CPU-host cleanup_dist_env_and_memory fixture noise (no accelerator), identical on base. Full deepseek parser suites: 24 passed / 2 xfailed (errors all teardown noise).
No regression on well-formed input: a valid <｜tool▁calls▁begin｜>…get_weather…```json```… call still parses to 1 tool call at head in <1 ms with the timeout arg present. The regex module's timeout only interrupts pathological backtracking; ordinary matches complete far under 1 s.
Not a duplicate: #54678 (poolside_v1/dots rewrite), #52119, #45172, #54090 cover different parsers/mechanisms — confirmed no open PR adds timeouts to these deepseek parsers.
Non-blocking note: envs parses the var as int, so sub-second values (e.g. 0.2) raise ValueError at call time (falls into the generic except Exception path and still fails soft). Consistent with sibling parsers; flagging only so nobody assumes float granularity.
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Co-authored-by: Cursor Agent Signed-off-by: Juan Pérez de Algaba <jperezde@redhat.com>
A streaming TimeoutError used to leave parser state active, so later deltas re-ran the same regex and could stall the event loop once per token. Latch the timeout for the rest of the stream. Co-authored-by: Cursor Agent Signed-off-by: Juan Pérez de Algaba <jperezde@redhat.com> Co-authored-by: OpenAI Codex
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Summary
The
deepseek_v3anddeepseek_v31tool parsers run multi-.*regexpatterns on model output without a timeout. Sibling parsers already passtimeout=VLLM_TOOL_PARSE_REGEX_TIMEOUT_SECONDSso a pathological completion cannot stall the API-server event loop. This applies the same limit and treatsTimeoutErroras "no tool call" / skip the stream delta.This is not a duplicate of #54678 (poolside_v1 / dots regex rewrite) or other open timeout work: those do not cover these DeepSeek parsers.
Changes
vllm/tool_parsers/deepseekv3_tool_parser.py: pass the existing regex timeout onfindall/ both streamingmatchsites; catchTimeoutError.vllm/tool_parsers/deepseekv31_tool_parser.py: same for the sibling parser (greedy.*on the streaming patterns).Codepath coverage
extract_tool_calls(findall) for both parsers.matchand namematchfor both parsers.Tests
test_regex_timeout_treated_as_no_tool_call— timeout is fail-closed (content returned, no tool calls) andtimeout=is passed.test_streaming_portion_regex_timeout_skips_delta— streaming portion match times out and skips the delta.test_streaming_name_regex_timeout_skips_delta— streaming name-regex fallback times out and skips the delta.Well-formed DeepSeek tool-call strings still parse after the timeout argument is added. No model-output change for valid completions; no eval rerun.
AI assistance
This PR was developed with AI assistance.
Made with Cursor
Rebase validation — 2026-10-27
Rebased onto upstream main, preserving the original fix and current surrounding behavior. The duplicate audit found no complete merged or open replacement for this PR’s remaining control.
Validation on macOS CPU: 8 timeout regressions passed; the full suites had 25 fixture errors because the required tokenizer is unavailable offline. All applicable changed-file pre-commit checks and
git diff --checkpassed.VLLM_TARGET_DEVICE=cpu VLLM_PLUGINS='' PYTHONPATH=. HF_HUB_OFFLINE=1 .venv/bin/python -m pytest tests/tool_parsers/test_deepseekv3_tool_parser.py tests/tool_parsers/test_deepseekv31_tool_parser.py -k timeout -q --tb=short -p no:cacheproviderNative GPU/RDMA execution and model evaluations were not run during this rebase; required CI and human review remain pending. AI assistance (OpenAI Codex) was used for the conflict resolution and validation.