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CVE-2025-12983— Memory Allocation with Excessive Size Value 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是美国GitLab公司的一个开源的端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE和EE 18.3.6之前的16.9版本至18.3版本、18.4.4之前的18.4版本和18.5.2之前的18.5版本存在安全漏洞，该漏洞源于提交特制markdown内容可能导致拒绝服务。

CVSS 3.5 · Low EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-12983

Vulnerability Information
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Vulnerability Title
Memory Allocation with Excessive Size Value in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司的一个开源的端到端软件开发平台，具有内置的版本控制、问题跟踪、代码审查、CI/CD（持续集成和持续交付）等功能。 GitLab CE和EE 18.3.6之前的16.9版本至18.3版本、18.4.4之前的18.4版本和18.5.2之前的18.5版本存在安全漏洞，该漏洞源于提交特制markdown内容可能导致拒绝服务。
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 16.9 ~ 18.3.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-12983

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III. Intelligence Information for CVE-2025-12983

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Patches & Fixes for CVE-2025-12983 (1)

Same Patch Batch · GitLab · 2025-11-15 · 8 CVEs total

CVE-2025-6171 5.3 MEDIUM Missing Authorization in GitLab
CVE-2025-2615 4.3 MEDIUM Insertion of Sensitive Information Into Sent Data in GitLab
CVE-2025-7000 4.3 MEDIUM Insertion of Sensitive Information Into Sent Data in GitLab
CVE-2025-11865 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2025-6945 3.5 LOW Improper Neutralization of Special Elements used in a Command ('Command Injection') in Git
CVE-2025-7736 3.1 LOW Incorrect Authorization in GitLab
CVE-2025-11990 3.1 LOW Improper Handling of URL Encoding (Hex Encoding) in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-789

V. Comments for CVE-2025-12983

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