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CVE-2025-15104— Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF

Quick assessment

Affected
The Nu Html Checker The Nu Html Checker
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.

The Nu Html Checker是The Nu Html Checker (vnu)开源的一款用于验证HTML文档是否符合现代Web标准的工具。 The Nu Html Checker存在安全漏洞，该漏洞源于存在限制绕过，可能导致远程攻击者使服务器向内部资源发起任意HTTP/HTTPS请求。

AI Predicted 7.5 Difficulty: Easy EPSS 0.47% · P39
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I. Basic Information for CVE-2025-15104

Vulnerability Information
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Vulnerability Title
Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF
Source: CVE Program / CVE List V5
Vulnerability Description
Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
The Nu Html Checker 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Nu Html Checker是The Nu Html Checker (vnu)开源的一款用于验证HTML文档是否符合现代Web标准的工具。 The Nu Html Checker存在安全漏洞，该漏洞源于存在限制绕过，可能导致远程攻击者使服务器向内部资源发起任意HTTP/HTTPS请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Nu Html Checker The Nu Html Checker latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd -

II. Public POCs for CVE-2025-15104

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III. Intelligence Information for CVE-2025-15104

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Vendor Advisories for CVE-2025-15104 (1)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2025-15104

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