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Vulnerabilities

Security fix · CVE-2025-15104

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

Published Jan 16, 2026 · catalog updated Jan 16, 2026 · The Nu Html Checker The Nu Html Checker

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-15104. EPSS is 0.46%. Act only if a listed version of The Nu Html Checker The Nu Html Checker is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Vendor / distro source
Affected products
vendor The Nu Html Checker The Nu Html Checker latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd

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).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor The Nu Html Checker The Nu Html Checker latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cdlatest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd

How to fix CVE-2025-15104

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-15104. EPSS is 0.46%. Act only if a listed version of The Nu Html Checker The Nu Html Checker is installed.

Which versions are affected?

Compare what you have installed with The Nu Html Checker The Nu Html Checker latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 16, 2026 · EUVD

    Detected

    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 lo

  2. Jan 16, 2026 · EUVD

    Updated

    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 lo

Sources

  • CVE.orgVulnerability recordCVE-2025-15104

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-15104

    30-day exploitation probability 0.46%

    first.org
  • EUVDVulnerability recordEUVD-2026-2919

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 5, 2026
  • EUVDNov 5, 2026