CVE-2026-40893 PUBLISHED

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

Assigner: GitHub_M
Reserved: 15.04.2026 Published: 14.05.2026 Updated: 14.05.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	gotenberg
Product	gotenberg
Versions	Version < 8.31.0 is affected

References

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

Problem Types

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