How severe is CVE-2026-3136?

CVE-2026-3136 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3136?

CVE-2026-3136 affects Google Cloud Build. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-3136 have an EU (EUVD) identifier?

Yes. CVE-2026-3136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9302.

When was CVE-2026-3136 published?

CVE-2026-3136 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-3136

CVE-2026-3136 is a critical-severity vulnerability in Google Cloud Build with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.6
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9302
Weakness: CWE-863
Affected product: Google Cloud Build
Published: 2026-03-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3136?: CVE-2026-3136 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3136?: CVE-2026-3136 affects Google Cloud Build. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-3136 have an EU (EUVD) identifier?: Yes. CVE-2026-3136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9302.
When was CVE-2026-3136 published?: CVE-2026-3136 was published on 2026-03-03 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:google:cloud_build:*:*:*:*:*:*:*:*

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