CVE-2026-110240

Lancet through 2.3.9 SSRF Protection Bypass via netutil.IsInternalIP

Published Oct 13, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Duke-git
Duke-git lancet
Vendors & Products Duke-git
Duke-git lancet
Type Values Removed Values Added
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.
Title Lancet through 2.3.9 SSRF Protection Bypass via netutil.IsInternalIP
First Time appeared Lancet Project
Lancet Project lancet
Weaknesses CWE-918
CPEs cpe:2.3:a:lancet_project:lancet:*:*:*:*:*:*:*:*
Vendors & Products Lancet Project
Lancet Project lancet
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 13, 2026, 7:24 PM
Reserved
Oct 13, 2026, 6:00 PM
Status
Awaiting Analysis
Published
Oct 13, 2026, 7:18 PM
Modified
Oct 13, 2026, 8:17 PM