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).
History

Fri, 16 Jan 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 16 Jan 2026 14:15:00 +0000

Type Values Removed Values Added
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).
Title Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF
First Time appeared The Nu Html Checker
The Nu Html Checker the Nu Html Checker
Weaknesses CWE-918
CPEs cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:linux:*:*:*:*:*
cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:macos:*:*:*:*:*
cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:windows:*:*:*:*:*
Vendors & Products The Nu Html Checker
The Nu Html Checker the Nu Html Checker
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Fluid Attacks

Published: 2026-01-16T14:00:16.643Z

Updated: 2026-01-16T14:30:55.715Z

Reserved: 2025-12-26T13:34:45.583Z

Link: CVE-2025-15104

cve-icon Vulnrichment

Updated: 2026-01-16T14:30:37.624Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-16T14:15:54.317

Modified: 2026-01-16T15:55:12.257

Link: CVE-2025-15104

cve-icon Redhat

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