Improper Certificate Validation Affecting undertow package, versions *


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.22% (13th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-UNDERTOW-18746986
  • published13 Aug 2026
  • disclosed11 Aug 2026

Introduced: 11 Aug 2026

NewCVE-2026-15554  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable undertow.

NVD Description

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

the Undertow AJP listener honours forged ssl_cert and is_ssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT authentication by injecting a forged X.509 certificate via the AJP protocol.

CVSS Base Scores

version 3.1