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

Quick assessment

Affected
GitLab GitLab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitLab Enterprise Edition（EE）和GitLab Community Edition（CE）都是美国GitLab公司的产品。GitLab Enterprise Edition是一套内容管理系统。GitLab Community Edition是一种社区版 GitLab 。 GitLab CE和EE 7.12版本至18.1.6之前版本、18.2版本至18.2.6之前版本和18.3版本至18.3.2之前版本存在安全漏洞，该漏洞源于未授权用户可通过发送多个并发大型SAML响应导致实例无响

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-2256

Vulnerability Information
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Vulnerability Title
Improper Validation of Specified Quantity in Input in GitLab
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab CE和EE 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab Enterprise Edition（EE）和GitLab Community Edition（CE）都是美国GitLab公司的产品。GitLab Enterprise Edition是一套内容管理系统。GitLab Community Edition是一种社区版 GitLab 。 GitLab CE和EE 7.12版本至18.1.6之前版本、18.2版本至18.2.6之前版本和18.3版本至18.3.2之前版本存在安全漏洞，该漏洞源于未授权用户可通过发送多个并发大型SAML响应导致实例无响
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 7.12 ~ 18.1.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-2256

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III. Intelligence Information for CVE-2025-2256

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Patches & Fixes for CVE-2025-2256 (1)

Same Patch Batch · GitLab · 2025-09-12 · 6 CVEs total

CVE-2025-6454 8.5 HIGH Server-Side Request Forgery (SSRF) in GitLab
CVE-2025-10094 6.5 MEDIUM Improper Validation of Specified Quantity in Input in GitLab
CVE-2025-7337 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-1250 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-6769 4.3 MEDIUM Exposure of Sensitive System Information to an Unauthorized Control Sphere in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-1284

V. Comments for CVE-2025-2256

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