Vulnerability · Published Apr 9, 2026 · Assigned by redhat
CVE-2026-1584Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder
High 7.5
In plain English
A high-severity null pointer dereference in gnutls. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | gnutls | 3.8.12-r0 | ALPINE-CVE-2026-1584 |
| Alpine:v3.21 | gnutls | 3.8.12-r0 | ALPINE-CVE-2026-1584 |
| Alpine:v3.22 | gnutls | 3.8.12-r0 | ALPINE-CVE-2026-1584 |
| Alpine:v3.23 | gnutls | 3.8.12-r0 | ALPINE-CVE-2026-1584 |
| Alpine:v3.24 | gnutls | 3.8.12-r0 | ALPINE-CVE-2026-1584 |
| Debian:14 | gnutls28 | 3.8.12-1 | DEBIAN-CVE-2026-1584 |
| Ubuntu:22.04:LTS | gnutls28 | no fix listed | UBUNTU-CVE-2026-1584 |
| Ubuntu:24.04:LTS | gnutls28 | no fix listed | UBUNTU-CVE-2026-1584 |
| Ubuntu:25.10 | gnutls28 | no fix listed | UBUNTU-CVE-2026-1584 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gnutls | 0 | |
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- RHSA-2026:7477 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-1584 vdb-entry, x_refsource_REDHAT
- RHBZ#2435258 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json x_sadp-csaf-vex