CVE record · CVE-2026-33845

Gnutls: gnutls: denial of service via dtls zero-length fragment

CVSS 7.5 HighEPSS 0.021 · 81st percentile

Published by the CVE Program (CNA: redhat) at 30 Apr 2026, 17:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Not given	Not given Package name: gnutls https://gitlab.com/gnutls/gnutls	affected before 3.8.13 semver Other versions: unaffected
Red Hat	Red Hat Enterprise Linux 10 Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.10-4.el10_2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.9-9.el10_0.19 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.3.29-9.el7_9.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-8.el8_10.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-8.el8_10.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.14-10.el8_4.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-3.el8_4.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.14-10.el8_4.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-3.el8_4.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-5.el8_6.5 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-3.el8_6.2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-5.el8_6.5 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-3.el8_6.2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-7.el8_8.4 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-4.el8_8.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.16-7.el8_8.4 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Package name: libtasn1 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.13-4.el8_8.1 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.10-4.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.10-4.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.7.6-21.el9_2.7 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.3-4.el9_4.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support Package name: gnutls https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.8.3-6.el9_6.4 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.12 Package name: openshift/ose-rhel-coreos-8 https://access.redhat.com/downloads/content/package-browser/	unaffected 412.86.202608241157-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.13 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 413.92.202609080414-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.14 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 414.92.202608172040-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.15 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 415.92.202608180329-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.16 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 416.94.202608150307-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.17 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 417.94.202608250221-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.18 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 418.94.202608142238-0 to before * rpm Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4.19 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	unaffected 4.19.9.6.202608182320-0 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.17 Package name: cert-manager/jetstack-cert-manager-acmesolver-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791371080 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.17 Package name: cert-manager/jetstack-cert-manager-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791371069 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.17 Package name: cert-manager/cert-manager-operator-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791788287 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.17 Package name: cert-manager/cert-manager-operator-bundle https://catalog.redhat.com/software/containers/	unaffected 1791970484 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18 Package name: cert-manager/jetstack-cert-manager-acmesolver-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791459707 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18 Package name: cert-manager/jetstack-cert-manager-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791459711 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18 Package name: cert-manager/cert-manager-istio-csr-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1791459759 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18 Package name: cert-manager/cert-manager-operator-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1789029076 to before * rpm Other versions: affected
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18 Package name: cert-manager/cert-manager-operator-bundle https://catalog.redhat.com/software/containers/	unaffected 1791966259 to before * rpm Other versions: affected

And 17 more products. The full list is on the CVE record.

Identifiers: CVE-2026-33845
CNA: redhat
Weakness (CWE): CWE-191
Tags: Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Memory corruption
Published: 30 Apr 2026
Updated: 4 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (redhat)Used for this record
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ADP (redhat-SADP)

CISA KEV Not listed.
EPSS 0.021, the 81st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

30 Apr 2026, 17:41 UTC Confirmed by the CVE List
30 Apr 2026, 18:16 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:13274 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:20611 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:20612 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:20613 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:26319 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:26409 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:29197 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:30004 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:30849 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:30850 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:32962 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:33125 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:34372 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:36004 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:36005 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:36006 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:41921 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:56786 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:56853 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:56911 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:57402 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:57483 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:58981 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:59831 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:60019 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:65839 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:72502 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:74674 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82304 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:82322 vendor-advisoryredhat

And 7 more on the CVE record.

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.