CVE-2026-40893: Gotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arbitrary File Rename and Move

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-14 · updated 2026-06-17
Weakness: CWE-73

Description

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, Gotenberg only checks if the tag is exactly FileName, so System:FileName slips right through and ExifTool happily renames the file. This allows remote attackers to move, rename, and change permissions for arbitrary files. This vulnerability is fixed in 8.31.0.

Affected products

gotenberg: before 8.31.0 — fixed in 8.31.0

How to fix

Upgrade to a fixed version: gotenberg 8.31.0. Check the vendor advisory for mitigations.

References

https://github.com/gotenberg/gotenberg/security/advisories/GHSA-62p3-hvxx-fxg4
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-62p3-hvxx-fxg4

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