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

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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
GitHubEnterprise 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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