CVE-2025-9820

CVE-2025-9820 · Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

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This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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 4.0 · Medium · EPSS 0.2% · Fix available

Published

2026-01-26T19:58:32.886Z

Updated

2026-10-14T19:46:28.307Z

Stack: system

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