CVE-2026-42590 (GCVE-0-2026-42590)
Vulnerability from cvelistv5 – Published: 2026-05-14 15:36 – Updated: 2026-05-15 15:57
VLAI
EPSS
VEX
Title
Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist
Summary
Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blocklist in Gotenberg can be bypassed using ExifTool's group-prefix syntax, enabling arbitrary file rename, move, hardlink, and symlink creation on the server. ExifTool supports group-prefix syntax where File:FileName is processed identically to FileName -- the prefix is stripped by SetNewValue in Writer.pl before tag matching. The safeKeyPattern regex (^[a-zA-Z0-9\-_.:]+$) allows colons, so prefixed tag names pass validation. Any prefix works: File:FileName, System:Directory, a:HardLink, etc. Additionally, FilePermissions, FileUserID, and FileGroupID pseudo-tags are not blocked at all and can modify file attributes without any prefix. This vulnerability is fixed in 8.30.0.
Severity
8.2 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-15 15:57 UTC
CWE
- CWE-184 - Incomplete List of Disallowed Inputs
Assigner
GitHub_M
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/gotenberg/gotenberg/security/a… | x_refsource_CONFIRM |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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