Incomplete List of Disallowed Inputs in gotenberg - CVE-2026-42590
Published: May 5, 2026
Vulnerability identifier: #VU129638
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42590
CWE-ID: CWE-184
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: thecodingmachine
Affected software:
gotenberg
gotenberg
Detailed vulnerability description
The vulnerability allows a remote attacker to modify files on the server.
The vulnerability exists due to incomplete list of disallowed inputs in pkg/modules/exiftool/exiftool.go when processing metadata write requests. A remote attacker can send specially crafted metadata keys using ExifTool group-prefix syntax to modify files on the server.
In deployments with mounted volumes or non-containerized setups, exploitation may enable arbitrary file read via symlink chaining and file overwrite via directory manipulation.
How to mitigate CVE-2026-42590
Install security update from vendor's website.