CVE-2026-73530

Description

Flyto2 Core before 2.28.0 contains a server-side request forgery guard bypass vulnerability that allows attackers to reach internal services by supplying URLs using the unblocked IPv6 address `::` which the kernel routes to loopback identically to `0.0.0.0`. Attackers can submit requests or trigger 302 redirects to ` to bypass the private IP range and blocked hostname checks in `is_private_ip()`, reaching services bound to IPv6 loopback across the `http.get`, `http.request`, and `http.batch` modules.

CVSS Vector

References

• https://github.com/flytohub/flyto-core/releases/tag/v2.28.0
• https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p
• https://www.vulncheck.com/advisories/flyto2-core-ssrf-guard-bypass-via-is-private-ip
• https://github.com/flytohub/flyto-core/security/advisories/GHSA-gc4h-hj7x-gp5p