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CVE-2026-54452— safeurl: Missing IPv6 CIDR Ranges in Blocklist

Quick assessment

Affected
doyensec safeurl
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.

是一个用于防止服务器端请求伪造（SSRF）的库。在 0.2.4 版本之前， 文件中的 列表遗漏了以下 IPv6 地址段： 、 、 和 。当应用程序通过 启用 IPv6 支持时，攻击者控制的位于这些被遗漏地址段内的目标地址不会被识别为非公网地址，从而能够通过 SSRF 目标检查，可能导致访问到位于这些被遗漏地址段内的资源。IPv6 默认是禁用的，因此保留 的配置不受此绕过方式影响。该问题已在 0.2.4 版本中修复。

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54452

Vulnerability Information
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Vulnerability Title
safeurl: Missing IPv6 CIDR Ranges in Blocklist
Source: CVE Program / CVE List V5
Vulnerability Description
safeurl is a server-side request forgery protection library. Prior to 0.2.4, the privateNetworks list in ip.go omits the IPv6 ranges 64:ff9b:1::/48, 5f00::/16, 3fff::/20, and 100:0:0:1::/64. When an application enables IPv6 with EnableIPv6(true), an attacker-controlled destination in one of these ranges is not recognized as non-public and can pass the SSRF destination check, potentially allowing access to resources hosted within the omitted ranges. IPv6 is disabled by default, and configurations that retain EnableIPv6(false) are not exposed to this bypass. This issue is fixed in version 0.2.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
doyensec safeurl < 0.2.4 -

II. Public POCs for CVE-2026-54452

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III. Intelligence Information for CVE-2026-54452

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Patches & Fixes for CVE-2026-54452 (3)

Vendor Advisories for CVE-2026-54452 (1)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2026-54452

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