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gnutls

A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.

The vulnerability CVE-2026-5260 in libgnutls arises from a buffer over-read condition triggered during an RSA key exchange when a remote attacker sends an extremely short premaster secret to a server using an RSA key backed by a PKCS#11 token. This causes a short heap overread, which is a form of memory corruption that can lead to information disclosure by leaking memory contents. The flaw is classified under CWE-126 (Buffer Over-read) and CWE-1284. The impact includes potential information disclosure and denial of service due to crashes or restarts. Red Hat has acknowledged the issue and released patches in gnutls version 3.7.6-21.el9_2.7 and related updates for Red Hat Enterprise Linux 9.2 variants. The vulnerability is rated high severity with a CVSS v3.1 score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H).

Detailed information about A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a serv

A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA… (CVE-2026-5260) - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-5260: Buffer Over-read

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