CVE-2025-2256: gitlab — Fix

Description

An issue has been discovered in GitLab CE/EE affecting all versions from 7.12 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 that could have allowed unauthorized users to render the GitLab instance unresponsive to legitimate users by sending multiple concurrent large SAML responses.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-1284 CWE-1284

Affected Products

Vendor	Product	Versions
gitlab	gitlab	7.12.0 — 18.1.6
gitlab	gitlab	7.12.0 — 18.1.6
gitlab	gitlab	18.2.0 — 18.2.6
gitlab	gitlab	18.2.0 — 18.2.6
gitlab	gitlab	18.3.0 — 18.3.2
gitlab	gitlab	18.3.0 — 18.3.2

References

Advisories & Patches

https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/

Other References

https://gitlab.com/gitlab-org/gitlab/-/issues/524633 https://hackerone.com/reports/3019485

Frequently Asked Questions

What is CVE-2025-2256? +

An issue has been discovered in GitLab CE/EE affecting all versions from 7.12 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 that could have allowed unauthorized users to render the GitLab instance unresponsive to legitimate users by sending multiple concurrent large SAML responses. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-2256? +

CVE-2025-2256 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-2256? +

CVE-2025-2256 affects products from gitlab, specifically: gitlab. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-2256? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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