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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-8034 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc. (Products Only)
CVSS-B 7.9 HIGH
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://docs.github.com/en/[email protected]/admin/release-notes#3.16.18 GitHub, Inc. (Products Only) Release Notes  Vendor Advisory 
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.15 GitHub, Inc. (Products Only) Release Notes  Vendor Advisory 
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.9 GitHub, Inc. (Products Only) Release Notes  Vendor Advisory 
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.6 GitHub, Inc. (Products Only) Release Notes  Vendor Advisory 
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.2 GitHub, Inc. (Products Only) Release Notes  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-436 Interpretation Conflict GitHub, Inc. (Products Only)  
CWE-918 Server-Side Request Forgery (SSRF) GitHub, Inc. (Products Only)  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-8034
NVD Published Date:
05/07/2026
NVD Last Modified:
05/11/2026
Source:
GitHub, Inc. (Products Only)