CVE-2025-2256

HIGH

GitLab 7.12-18.1.5, 18.2-18.2.5, 18.3-18.3.1 - Denial of Service via Large SAML Responses

Title source: llm
STIX 2.1

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.

References (3)

Core 3
Core References
Broken Link issue-tracking permissions-required
https://gitlab.com/gitlab-org/gitlab/-/issues/524633
Permissions Required technical-description exploit permissions-required
https://hackerone.com/reports/3019485

Scores

CVSS v3 7.5
EPSS 0.0047
EPSS Percentile 36.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-1284
Status published
Products (1)
gitlab/gitlab 7.12.0 - 18.1.6 (2 CPE variants)
Published Sep 12, 2025
Tracked Since Feb 18, 2026