9.1

CVE-2026-17556

Path traversal in GitHub Enterprise Server allowed unauthenticated deletion of instance storage via the X-GitHub-Request-Id header

A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to delete arbitrary files and directories on the instance, including the entire user storage directory containing Git LFS objects, release assets, attachments, and avatars. The X-GitHub-Request-Id request header was used without sanitization as a filesystem path segment for the upload buffer directory, so a traversal value pointed the buffer at an arbitrary path and the deferred cleanup routine recursively removed the traversed target. Exploitation required only network reachability to the instance and no authentication, and it worked even when private mode was enabled. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.4, 3.20.6, 3.19.10, 3.18.13 and 3.17.19. This vulnerability was reported via the GitHub Bug Bounty program.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Github ≫ Enterprise Server Version < 3.17.19
Github ≫ Enterprise Server Version >= 3.18.0 < 3.18.13
Github ≫ Enterprise Server Version >= 3.19.0 < 3.19.10
Github ≫ Enterprise Server Version >= 3.20.0 < 3.20.6
Github ≫ Enterprise Server Version >= 3.21.0 < 3.21.4
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.5% 0.409
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
product-cna@github.com 8.8 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.19
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.13
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.10
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.6
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.4
Product
Release Notes