CVE-2026-110240
Lancet through 2.3.9 SSRF Protection Bypass via netutil.IsInternalIP
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | duke-git |
| Product | lancet |
| Published | Oct 13, 2026 |
| Last Updated | Oct 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
duke-git / lancet
2.1.2 ≤ 2.3.9
duke-git / lancet
1.3.1 ≤ 1.4.6
References
github.com: https://github.com/duke-git/lancet/issues/356 github.com: https://github.com/duke-git/lancet/pull/357 github.com: https://github.com/duke-git/lancet/commit/835111c832939a85416d686a1e99d5fe7060c9b4 github.com: https://github.com/duke-git/lancet/blob/v2.3.9/netutil/net.go#L192-L205 github.com: https://github.com/duke-git/lancet/blob/v1.4.6/netutil/net.go#L158-L170 github.com: https://github.com/duke-git/lancet vulncheck.com: https://www.vulncheck.com/advisories/lancet-through-2.3.9-ssrf-protection-bypass-via-netutil-isinternalip
Credits
George Chen