CVE-2026-42590
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/gotenberg/gotenberg/v8Go | <= 8.29.1 | — |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-7v3r-m9c8-r855ghsaADVISORY
- github.com/advisories/GHSA-qmwh-9m9c-h36mghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42590ghsaADVISORY
News mentions
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