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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.8.12-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | gnutls +7 | 3.8.12-1.1.hum1 | RHSA-2026:7477 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.12-1.1 | openSUSE-SU-2026:10177-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.8.12-r0 | — |
| Alpine v3.23 | gnutls | 3.8.12-r0 | — |
| Alpine v3.22 | gnutls | 3.8.12-r0 | — |
| Alpine v3.21 | gnutls | 3.8.12-r0 | — |
| Alpine v3.20 | gnutls | 3.8.12-r0 | — |
Advisories 3
- WID-SEC-2026-0359 GnuTLS: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 1, 2026
- RHSA-2026:7477 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- openSUSE-SU-2026:10177-1 gnutls-3.8.12-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- RHSA-2026:7477 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-1584 vdb-entry
- RHBZ#2435258 issue-tracking