SVIXSEC-2026-0001: Svix SSRF bypass

Svix is an enterprise-ready webhooks service designed to build secure, reliable, and scalable platforms. Recently, Svix experienced its first significant security incident involving a Server-Side Request Forgery (SSRF) vulnerability, which could potentially allow attackers to bypass SSRF protections by targeting nodes via IP addresses. This issue, identified by external researcher Kim Dong-Uk, is pending formal CVE assignment but currently uses a temporary identifier, SVIXSEC-2026-0001. It primarily affects open-source and self-hosted enterprise users, who are advised to update or follow specific instructions. The vulnerability arose partly due to differences between Python and Rust in handling IP literals, leading Svix to enhance its IP filtering logic and plan further improvements in the network layer. As part of the response, Svix has made its code more accessible to security scanners by embedding metadata in its Docker images and binaries, aiming to improve legibility for security teams. Svix is working with MITRE to secure a CVE and encourages users to stay informed through various channels.

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