High severity · published Sep 12, 2025
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…
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
7.12.0 before 18.1.6; 7.12.0 before 18.1.6; 18.2.0 before 18.2.6; 18.2.0 before 18.2.6; 18.3.0 before 18.3.2; 18.3.0 before 18.3.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-2256
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-2256
Release Notes
https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/issues/524633
Permissions Required
https://hackerone.com/reports/3019485
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