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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
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
VendorProductAffected VersionsCPESubscribe
The Nu Html CheckerThe 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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IV. Related Vulnerabilities
V. Comments for CVE-2025-15104

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