Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function_CVE-2025-9820

4 / 10

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Description

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.

Basic Information

ID CVE-2025-9820

Source redhat

Published Jan 26, 2026 at 19:58

Modified Jan 26, 2026 at 20:12

Affected Product

Vendor Red Hat

Product Red Hat Enterprise Linux 10

CWE Classification

CWE-121

References

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    "published": "2026-01-26T19:58:32.886Z",
    "modified": "2026-01-26T20:12:19.249Z",
    "type": "cve",
    "title": "Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2025-9820\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2392528\nhttps://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5\nhttps://gitlab.com/gnutls/gnutls/-/issues/1732\nhttps://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18",
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