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CVE-2026-8034— Server-side request forgery vulnerability in GitHub Enterprise Server notebook viewer via URL parser confusion

Quick assessment

Affected
GitHub Enterprise Server
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.

GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21之前版本存在安全漏洞，该漏洞源于URL解析器混淆，可能导致服务器端请求伪造攻击，允许攻击者访问内部服务。

AI Predicted 7.4 Difficulty: Easy EPSS 0.38% · P31

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
GitHub Enterprise Server 3.16.0≤ 3.16.17 affected
3.17.0≤ 3.17.14 affected
3.18.0≤ 3.18.8 affected
3.19.0≤ 3.19.5 affected
3.20.0≤ 3.20.1 affected
3.21.0 unaffected
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I. Basic Information for CVE-2026-8034

Vulnerability Information
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Vulnerability Title
Server-side request forgery vulnerability in GitHub Enterprise Server notebook viewer via URL parser confusion
Source: CVE Program / CVE List V5
Vulnerability Description
A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21之前版本存在安全漏洞，该漏洞源于URL解析器混淆，可能导致服务器端请求伪造攻击，允许攻击者访问内部服务。
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
GitHub Enterprise Server 3.16.0 ~ 3.16.17 -

II. Public POCs for CVE-2026-8034

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III. Intelligence Information for CVE-2026-8034

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Same Patch Batch · GitHub · 2026-05-07 · 4 CVEs total

CVE-2026-6736 Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local
CVE-2026-7541 Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via
CVE-2026-8106 Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console logi

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-918

V. Comments for CVE-2026-8034

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