Improper Validation of Specified Quantity in Input Affecting gnutls28 package, versions <3.8.13-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.42% (34th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-GNUTLS28-16344313
  • published2 May 2026
  • disclosed26 May 2026

Introduced: 2 May 2026

CVE-2026-42013  (opens in a new tab)
CWE-1284  (opens in a new tab)

How to fix?

Upgrade Debian:unstable gnutls28 to version 3.8.13-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls28 package and not the gnutls28 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

CVSS Base Scores

version 3.1