Server-Side Request Forgery (SSRF) in gotenberg - #VU162922
Published: November 9, 2026
Vulnerability identifier: #VU162922
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to bypass outbound restrictions and read internal WebSocket service data through server-side request forgery.
The vulnerability exists due to missing WebSocket policy enforcement in Gotenberg's Chromium component when URL allow/deny lists are configured while --chromium-deny-private-ips and --chromium-deny-public-ips remain false. An unauthenticated remote attacker can submit a conversion URL serving controlled JavaScript from an allowed origin to connect to blocked loopback or link-local services and include returned data in the generated PDF.
Affected software
gotenberg
Remediation
Install security update from vendor's website.
gotenberg - update to 8.38.0