What is CVE-2026-3136?

CVE-2026-3136 is a critical-severity vulnerability in Google Cloud Build, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-03-03.

How severe is CVE-2026-3136?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Google Cloud Build

CVE-2026-3136

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.

Vulnerability class: Broken Access Control

EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Google Cloud_build
Google Cloud Build — versions 0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

f45cbf4e-4146-4068-b7e1-655ffc2c548c (Release Notes)

Frequently asked questions

What is CVE-2026-3136?: CVE-2026-3136 is a critical-severity vulnerability in Google Cloud Build, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-03-03.
How severe is CVE-2026-3136?: Critical severity. CVSS v3 base score is 9.8 out of 10.