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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue Tracking, Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue Tracking, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · gnu, redhatNVD modified 2026-10-26 21:10
Affected (CPE criteria) 2
cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:*cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
References 7
- https://access.redhat.com/errata/RHSA-2026:7477
- https://access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue Tracking, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:7477
- https://access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue Tracking, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json