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.
Affected products
gnu: gnutls; redhat: hardened images
References7
- access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue TrackingVendor Advisory
- access.redhat.com/security/cve/CVE-2026-1584 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2435258 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:7477
- access.redhat.com/errata/RHSA-2026:7477
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 72 · as of 12 November 2026
- CWE
- CWE-476
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.