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

published 2026-05-04 6 mo ago modified 2026-06-25 4 mo ago also GHSA-62p3-hvxx-fxg4 , GO-2026-5162 , EUVD-2026-30307

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 1

thecodingmachine gotenberg 8.31.0

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 5 mo ago (2026-05-14)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/gotenberg/gotenberg/security/advisories/GHSA-62p3-hvxx-fxg4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
GitHub	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Affected packages

ecosystem	package	affected	fixed in
go	github.com/gotenberg/gotenberg/v8	<=8.30.1 all versions	no fix listed
go	github.com/gotenberg/gotenberg/v7	all versions	no fix listed

Affected products

gotenberg gotenberg

Classification

Weakness

CWE-73 External Control of File Name or Path
CWE-184 Incomplete List of Disallowed Inputs
CWE-20 Improper Input Validation

References

github.com /gotenberg/gotenberg/security/advisories/GHSA-62p3-hvxx-fxg4
exploit, web, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-40893
advisory
github.com /gotenberg/gotenberg
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary