Vulnerability Description
Twenty is an open source CRM built with NestJS (Node.js). In versions 1.18.0 and earlier, the SSRF protection in twenty-server's SecureHttpClientService can be bypassed using IPv4-mapped IPv6 addresses in URL IP literals. Node.js's URL parser normalizes IPv4-mapped IPv6 addresses to compressed hex form (e.g., ::ffff:169.254.169.254 becomes ::ffff:a9fe:a9fe), but the isPrivateIp utility only recognizes the dotted-decimal notation. As a result, the hex form passes the SSRF check unchecked. Additionally, the socket lookup validation event does not fire for IP literal addresses, bypassing the second validation layer. An authenticated user can reach any internal IP, including cloud metadata endpoints, to exfiltrate credentials such as IAM keys.
Related Weaknesses (CWE)
References
- https://github.com/twentyhq/twenty/security/advisories/GHSA-vrcj-hv2q-c58m
- https://github.com/twentyhq/twenty/security/advisories/GHSA-vrcj-hv2q-c58m
FAQ
What is CVE-2026-33975?
CVE-2026-33975 is a documented vulnerability. Twenty is an open source CRM built with NestJS (Node.js). In versions 1.18.0 and earlier, the SSRF protection in twenty-server's SecureHttpClientService can be bypassed using IPv4-mapped IPv6 addresse...
How severe is CVE-2026-33975?
CVSS scoring is not yet available for CVE-2026-33975. Check NVD for updates.
Is there a patch for CVE-2026-33975?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.