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CVE-2026-12635— Reliance on Reverse DNS Resolution for a Security-Critical Action 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公司开源的一个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/EE存在授权问题漏洞，该漏洞源于URL验证不足，可能导致具有维护者权限的认证用户通过镜像同步向内部网络资源发出请求。以下版本受到影响：8.3至18.11.6之前版本、19.0至19.0.3之前版本和19.1至19.1.1之前版本。

EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 3

VendorProduct Version RangeStatus
GitLab GitLab 8.3< 18.11.6 affected
19.0< 19.0.3 affected
19.1< 19.1.1 affected
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I. Basic Information for CVE-2026-12635

Vulnerability Information
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Vulnerability Title
Reliance on Reverse DNS Resolution for a Security-Critical Action in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 8.3 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with maintainer-role permissions to make requests to internal network resources through mirror synchronization due to improper URL validation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当地信任反向DNS
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司开源的一个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/EE存在授权问题漏洞，该漏洞源于URL验证不足，可能导致具有维护者权限的认证用户通过镜像同步向内部网络资源发出请求。以下版本受到影响：8.3至18.11.6之前版本、19.0至19.0.3之前版本和19.1至19.1.1之前版本。
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 8.3 ~ 18.11.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12635

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III. Intelligence Information for CVE-2026-12635

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Patches & Fixes for CVE-2026-12635 (2)

Same Patch Batch · GitLab · 2026-06-25 · 13 CVEs total

CVE-2026-10086 8.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-12053 8.6 HIGH Insertion of Sensitive Information into Log File in GitLab
CVE-2026-10712 8.0 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2026-5309 5.4 MEDIUM Authorization Bypass Through User-Controlled Key in GitLab
CVE-2026-11379 5.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-2238 5.3 MEDIUM Missing Authorization in GitLab
CVE-2026-8330 4.4 MEDIUM Insertion of Sensitive Information into Log File in GitLab
CVE-2026-5952 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-5796 4.3 MEDIUM Incorrect Authorization in GitLab
CVE-2026-1606 4.3 MEDIUM Improper Control of Generation of Code ('Code Injection') in GitLab
CVE-2026-0934 3.8 LOW Incorrect Authorization in GitLab
CVE-2026-3176 3.1 LOW Missing Authorization in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-350

V. Comments for CVE-2026-12635

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