Vulnerability details

CVE-2026-1584

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

CVSS 3.1

7.5High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (redhat)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
7.5High	3.1	CVEProject cvelistV5 (CNA) (redhat-SADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
No product information recorded.

References and advisories

https://access.redhat.com/security/cve/CVE-2026-1584 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2435258 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:7477 vendor-advisoryx_refsource_REDHAT

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Details

Published: 2026-04-09
Last updated: 2026-11-05
State: Published
Assigner (CNA): redhat

Exploit prediction (EPSS)

1.37%

Probability of exploitation in 30 days

72.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-476
NULL Pointer Dereference