SSRF in Duke-Git Lancet
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 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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/duke-git/lancet/issues/356 (issue-tracking, technical-description)
- github.com/duke-git/lancet/pull/357 (issue-tracking, patch)
- github.com/duke-git/lancet/commit/835111c832939a85416d686a1e99d5fe7060c9b4 (patch)
- github.com/duke-git/lancet/blob/v2.3.9/netutil/net.go (technical-description)
- github.com/duke-git/lancet/blob/v1.4.6/netutil/net.go (technical-description)
- github.com/duke-git/lancet (product)
- www.vulncheck.com/advisories/lancet-through-2.3.9-ssrf-protection-bypass-via-ne… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110240?
- CVE-2026-110240 is a medium-severity vulnerability in Duke-Git Lancet, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.8/10. Published 2026-10-13.
- How severe is CVE-2026-110240?
- Medium severity. CVSS v3 base score is 4.8 out of 10.