CVE-2026-1584

Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder

State: Published
Severity: 7.5 High
Published: Apr 9, 2026
Updated: Sep 1, 2026
Reserved: Jan 29, 2026

Description

A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted ClientHello message with an invalid Pre-Shared Key (PSK) binder value during the TLS handshake. This can lead to a NULL pointer dereference, causing the server to crash and resulting in a remote Denial of Service (DoS) condition.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat-SADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
gnutls	0Affected
Red Hat Hardened ImagesRed Hat	3.8.12-1.1.hum1 and laterNot affected
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 4Red Hat

References

RHSA-2026:7477vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-1584vdb-entry
RHBZ#2435258issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json

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