Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-110240— Lancet through 2.3.9 SSRF Protection Bypass via netutil.IsInternalIP

Quick assessment

Affected
duke-git lancet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Lancet 版本低至 2.3.9 存在 SSRF（服务器端请求伪造）防护绕过漏洞，该漏洞出现在 函数中，其错误地将 IPv6 私有地址、链路本地地址、CGNAT（运营商级 NAT）地址以及过渡机制地址识别为外部地址。攻击者可以提供指向这些地址形式的域名，其中包括使用 NAT64、6to4 或 Teredo 等隧道技术嵌入内部 IPv4 地址的域名，从而绕过防护并访问内部服务或云元数据端点。

CVSS 4.8 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
duke-git lancet 2.1.2≤ 2.3.9 affected
1.3.1≤ 1.4.6 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-110240

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Lancet through 2.3.9 SSRF Protection Bypass via netutil.IsInternalIP
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
duke-git lancet 2.1.2 ~ 2.3.9 -
duke-git lancet 1.3.1 ~ 1.4.6 -

II. Public POCs for CVE-2026-110240

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-110240

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-110240 (2)

Vendor Advisories for CVE-2026-110240 (1)

News Coverage for CVE-2026-110240 (1)

Other References for CVE-2026-110240 (1)

IV. Related Vulnerabilities

Same product: lancet
Same vendor: duke-git
Same weakness: CWE-918

V. Comments for CVE-2026-110240

No comments yet

Leave a comment