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.
Advisories

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Fixes

Solution

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Workaround

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History

Tue, 13 Oct 2026 19:00:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-13T19:24:52.860Z

Reserved: 2026-10-13T18:00:16.590Z

Link: CVE-2026-110240

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T19:18:49.350

Modified: 2026-10-13T20:17:28.220

Link: CVE-2026-110240

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses