Input validation error in gotenberg - CVE-2026-40280
Published: May 4, 2026
Vulnerability identifier: #VU129630
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-40280
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger server-side request forgery.
The vulnerability exists due to improper input validation in webhook and downloadFrom deny-list protection when processing case-insensitive URL schemes. A remote attacker can supply a specially crafted URL to trigger server-side request forgery.
Affected software
gotenberg
How to mitigate CVE-2026-40280
Install security update from vendor's website.
gotenberg - update to 8.31.0