# CVE-2025-2256: Improper Validation of Specified Quantity in Input in GitLab

> CVE-2025-2256: Improper Validation of Specified Quantity in Input in GitLab. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-2256
Last updated: 2026-10-19T17:10:00Z

- Published: 2025-09-12 06:06 UTC · Updated: 2026-10-19 17:10 UTC · Assigner: GitLab
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.53%, 44th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1284

## 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.

## Affected vendors and products

- GitLab: GitLab

## Tracked companies

- [GitLab](https://rewindex.com/company/gitlab.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-2256)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-2256)
- [https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/](https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/)
- [https://gitlab.com/gitlab-org/gitlab/-/issues/524633](https://gitlab.com/gitlab-org/gitlab/-/issues/524633)
- [https://hackerone.com/reports/3019485](https://hackerone.com/reports/3019485)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-2256 · Markdown: https://rewindex.com/cve/CVE-2025-2256.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-2256 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:47:12.299Z