CVE-2026-32301: Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL

March 13, 2026 (updated March 16, 2026)

Centrifugo is vulnerable to Server-Side Request Forgery (SSRF) when configured with a dynamic JWKS endpoint URL using template variables (e.g. {{tenant}}). An unauthenticated attacker can craft a JWT with a malicious iss or aud claim value that gets interpolated into the JWKS fetch URL before the token signature is verified, causing Centrifugo to make an outbound HTTP request to an attacker-controlled destination.

References

github.com/advisories/GHSA-j77h-rr39-c552
github.com/centrifugal/centrifugo
github.com/centrifugal/centrifugo/security/advisories/GHSA-j77h-rr39-c552
nvd.nist.gov/vuln/detail/CVE-2026-32301

Code Behaviors & Features

Detect and mitigate CVE-2026-32301 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →