CVE-2026-55187

Mailpit contains an SSRF protection gap in Link Check API prior to v1.30.2. The internal IsInternalIP deny-list only blocks common IPv4 private/local addresses and CGNAT, and does not recognize several IPv6 forms that embed IPv4 destinations or IPv6 prefixes outside standard private ranges. Bypas...

CVE-2026-55187 Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)

Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms...

GO-2026-5688 Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms in github.com/axllent/mailpit

Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms in github.com/axllent/mailpit...