AUGUST 16, 2026
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Case File

CVE-2026-17556

HIGH · CVSS 8.8 EPSS 0.46% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-05 · Last synced 2026-08-16

CyberRota Analysis

AI-Generated

A path traversal vulnerability in GitHub Enterprise Server allows unauthenticated attackers to delete arbitrary files and directories, including critical user storage components, without requiring authentication. This issue affects all versions prior to 3.22, making it imperative for organizations using GitHub Enterprise Server to prioritize immediate updates to the patched versions 3.21.4, 3.20.6, 3.19.10, 3.18.13, or 3.17.19 to mitigate potential data loss.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-17556
Severity
HIGH
CVSS
8.8
EPSS
0.46%
GitHub

Original NVD Description

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.