High severity · published Apr 9, 2026
CVE-2026-1584
Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder
7.5
CVSS
1.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor, CISA
GN
Gnutls · Gnu
All versions, or not specified · source: NVD
HI
Hardened Images · Redhat
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1584
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1584
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:7477
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-1584
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2435258
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json
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