CVE-2025-2256 - CVE House
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Status published High CVE-2025-2256

Improper Validation of Specified Quantity in Input in GitLab

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Thanks [yuki_osaki](https://hackerone.com/yuki_osaki) and [lambdasawa](https://hackerone.com/lambdasawa) for reporting this vulnerability through our HackerOne bug bounty program

References

More from GitLab

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CVE-2025-9958
Insertion of Sensitive Information Into Sent Data in GitLab
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CVE-2025-9957
Incorrect Authorization in GitLab
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CVE-2025-9825
Missing Authorization in GitLab
Medium 5
CVE-2025-9642
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 8.7
CVE-2025-9484
Missing Authorization in GitLab
Medium 4.3

Affected Vendor

Affected Software

GitLab
Vulnerable Versions:
7.12, 18.2, 18.3

Timeline

Official Publish: September 12th, 2025
Last Modified: September 12th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-1284

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.