🛡️ CVE-2025-15104
🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-918 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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).

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-01-16
Updated 2026-06-02
Modified 2026-02-03
Fix URL N/A

Affected Packages

Software From version Fixed in
nu.validator:validator — —
validator — 2026-01-11
vnu-jar — —

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