Server-Side Request Forgery (SSRF) Affecting vnu package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.46% (39th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-VNU-16379932
  • published4 May 2026
  • disclosed16 Jan 2026

Introduced: 16 Jan 2026

CVE-2025-15104  (opens in a new tab)
CWE-918  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable vnu.

NVD Description

Note: Versions mentioned in the description apply only to the upstream vnu package and not the vnu package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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).

CVSS Base Scores

version 3.1