CVE-2026-1584

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

publishedCWE-476

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.

Technical severity7.5 highCVSS 3.1 · CNA: redhat

Published2026-04-09Source updated 2026-11-04

Collected2026-11-042 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: CNA: redhat

Fix

RHSA-2026:7477: Red Hat Hardened Images

Source: ADP: redhat-SADP

Workaround

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
`gnutls` https://gitlab.com/gnutls/gnutls	0 (affected)	CNA: redhat
Red Hat Hardened Images Red Hat `gnutls-main` https://catalog.redhat.com/software/containers/	≥ 3.8.12-1.1.hum1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openshift/ose-rhel-coreos-8` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openshift/ose-rhel-coreos-9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Hardened Images Red Hat `gnutls-main` https://access.redhat.com/downloads/content/package-browser/	≥ 3.8.12-1.1.hum1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `gnutls` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4 Red Hat `openshift/ose-rhel-coreos-8` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4 Red Hat `openshift/ose-rhel-coreos-9` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	CNA: redhat
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:7477CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-1584CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2435258CNA: redhat · issue-tracking, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-1584ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2435258ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:7477ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT

For agents and automation

Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.

Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.

Get an API key Use x402 Connect an agent

Endpoints and access details

https://api.y2.dev/api/v2/cyber/cves
https://api.y2.dev/api/v2/cyber/cves/{cveId}

A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.

For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.

Agent access JSON · OpenAPI · CVE API guide