Server-Side Request Forgery (SSRF) in gotenberg - CVE-2026-42596
Published: May 5, 2026
Vulnerability identifier: #VU129639
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42596
CWE-ID: CWE-918
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 perform server-side request forgery against internal HTTP services.
The vulnerability exists due to insufficient request destination validation in the downloadFrom and webhook features when processing attacker-supplied URLs. A remote attacker can supply a specially crafted URL to perform server-side request forgery against internal HTTP services.
The default deny-list is regex-based and case-sensitive, and can be bypassed using alternate address representations such as IPv4-mapped IPv6 loopback addresses.
How to mitigate CVE-2026-42596
Install security update from vendor's website.