Stack-based Buffer Overflow Affecting gnutls28 package, versions <3.8.11-3


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-GNUTLS28-14082338
  • published21 Nov 2025
  • disclosed26 Jan 2026

Introduced: 21 Nov 2025

CVE-2025-9820  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade Debian:unstable gnutls28 to version 3.8.11-3 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 the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.

CVSS Base Scores

version 3.1