buck2/20260102-r0: cve remediation

[octo-sts]

buck2/20260102-r0: fix GHSA-rhfx-m35p-ff5j

Advisory data: https://github.com/wolfi-dev/advisories/blob/main/buck2.advisories.yaml

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"Breadcrumbs" for this automated service

• Source Code: https://go/cve-remedy-automation-source
• Logs: https://go/cve-remedy-automation-logs
• Docs: (not provided yet)

Inspected git repositories: https://github.com/facebook/buck2@2026-01-02

[octo-sts]

📦 Build Failed: Missing Dependency

Error: failed reading file: open Cargo.lock: no such file or directory

Build Details

Category	Details
Build System	cargobump/Rust
Failure Point	cargobump --run-update=false --bump-file ./cargobump-deps.yaml command execution

Root Cause Analysis 🔍

The cargobump tool is trying to read a Cargo.lock file that doesn't exist in the current directory. This suggests that either the Rust project hasn't been properly initialized with cargo commands, or the Cargo.lock file is located in a different directory than where cargobump is being executed.

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🔍 Build failure fix suggestions

Found similar build failures that have been fixed in the past and analyzed them to suggest a fix:

Similar PRs with fixes

• efs-utils/2.3.3-r0: cve remediation #62912
• aws-otel-collector/0.44.0-r0: cve remediation #62905
• buck2/20250401-r2: cve remediation #62906

Suggested Changes

File: buck2.yaml

• modification at line 37 (pipeline section)
  Original:

  - uses: rust/cargobump

Replacement:

  - uses: rust/cargobump
    with:
      deps: |
        [email protected]

Content:

Add specific dependency updates to the cargobump step to address the CVE fix. The slab dependency update is based on the pattern from the efs-utils fix which addressed GHSA-qx2v-8332-m4fv, the same CVE mentioned in the current epoch bump.

Click to expand fix analysis

Analysis

Looking at the three similar fixes, I notice a clear pattern: all three cases involved Rust projects where the cargobump tool was failing to find Cargo.lock files. However, the fixes were not actually related to missing Cargo.lock files - they were all addressing CVE fixes by updating dependencies. The key insight is that the cargobump step is being used to update Rust dependencies, but in the current buck2.yaml, there's a "uses: rust/cargobump" step without any specific dependency updates specified. The similar fixes show that cargobump should be used with specific dependency version updates via the "deps" parameter, or in some cases, Go dependency updates were performed instead when the project had mixed Go/Rust components.

Click to expand fix explanation

Explanation

The current build failure occurs because the cargobump tool is being invoked without specific parameters, causing it to look for a Cargo.lock file in the wrong context. Based on the similar fixes, the solution is to provide specific dependency updates to cargobump. The epoch bump in the current file mentions 'GHSA-rhfx-m35p-ff5j' which suggests this is a security fix. Looking at the similar fixes, particularly the efs-utils case which also addressed GHSA-qx2v-8332-m4fv, the pattern is to specify exact dependency versions that need to be updated for CVE fixes. The [email protected] dependency update follows this pattern and should provide the necessary Cargo.toml modifications that cargobump needs to generate or update the Cargo.lock file correctly.

Click to expand alternative approaches

Alternative Approaches

• Remove the cargobump step entirely if no specific dependency updates are needed for this security fix
• Add a preliminary step to generate Cargo.lock by running 'cargo update' in the appropriate directory before cargobump
• Investigate if this should be a Go dependency update instead, similar to the aws-otel-collector fix, since buck2 might have both Rust and Go components
• Specify a different working directory for the cargobump step using 'working-directory' parameter if the Cargo.toml is in a subdirectory

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