Description
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 or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2.
Severity (CVSS)
| Base score | 5.8 |
|---|---|
| Severity | Medium |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N |
| Provided by | CNA |
Weaknesses
- CWE-918 — CWE-918: Server-Side Request Forgery (SSRF)
Affected products
| Vendor | Product | Versions |
|---|---|---|
| axllent | mailpit | < 1.30.2 |
References
- https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28 (x_refsource_CONFIRM)
- https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78 (x_refsource_MISC)
- https://github.com/axllent/mailpit/releases/tag/v1.30.2 (x_refsource_MISC)
Generated from the official CVE List on 11 Jul 2026 07:02 UTC.