CVE-2026-40893

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

State: Published
Severity: 8.2 High
Published: May 14, 2026
Updated: May 14, 2026
Reserved: Apr 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L	GitHub_M

Weaknesses

CWE-73 External Control of File Name or Path
CWE-184 Incomplete List of Disallowed Inputs

Affected Products

Product	Versions
gotenberggotenberg	< 8.31.0Affected

References

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

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