CVE-2026-110240
Medium
Description
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.
SeverityMedium
CVSS4.8
Exploit probability—
ProductDuke-git Lancet
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| duke-git lancet | 2.1.2 ≤ v ≤ 2.3.9, 1.3.1 ≤ v ≤ 1.4.6 | — |
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