MEDIUM 6.3 NVD
CVE-2026-110240
Lancet through 2.3.9 contains an SSRF protection bypass vulnerability in netutil.IsInternalIP that misclassifies IPv6 private, link-local, CGNAT and transition
Lancet through 2.3.9 contains an SSRF protection bypass vulnerability in netutil.IsInternalIP that misclassifies IPv6 private, link-local, CGNAT and transition addresses as external. Attackers can supply hostnames resolving to these address forms, including NAT64, 6to4 or Teredo embedding internal IPv4, to reach internal services or cloud metadata endpoints.
References
- https://github.com/duke-git/lancet
- https://github.com/duke-git/lancet/blob/v1.4.6/netutil/net.go#L158-L170
- https://github.com/duke-git/lancet/blob/v2.3.9/netutil/net.go#L192-L205
- https://github.com/duke-git/lancet/commit/835111c832939a85416d686a1e99d5fe7060c9b4
- https://github.com/duke-git/lancet/issues/356
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-13 via NVD.
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