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CVE Vulnerabilities

CVE-2026-42009

Undefined Behavior for Input to API

Published: May 18, 2026 | Modified: Jul 08, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-42009
CWEhttps://cwe.mitre.org/data/definitions/475.html

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.

Weakness

The behavior of this function is undefined unless its control parameter is set to a specific value.

Affected Software

NameVendorStart VersionEnd Version
GnutlsGnu- (including)- (including)
Hardened_imagesRedhat- (including)- (including)
Openshift_container_platformRedhat4.0 (including)4.0 (including)
Enterprise_linuxRedhat6.0 (including)6.0 (including)
Enterprise_linuxRedhat7.0 (including)7.0 (including)
Red Hat Enterprise Linux 10RedHatgnutls-0:3.8.10-4.el10_2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatgnutls-0:3.8.9-9.el10_0.19*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatgnutls-0:3.3.29-9.el7_9.1*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatgnutls-0:3.6.14-10.el8_4.1*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatlibtasn1-0:4.13-3.el8_4.1*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatgnutls-0:3.6.14-10.el8_4.1*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatlibtasn1-0:4.13-3.el8_4.1*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatgnutls-0:3.6.16-5.el8_6.5*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatlibtasn1-0:4.13-3.el8_6.2*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatgnutls-0:3.6.16-5.el8_6.5*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatlibtasn1-0:4.13-3.el8_6.2*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatgnutls-0:3.6.16-7.el8_8.4*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatlibtasn1-0:4.13-4.el8_8.1*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatgnutls-0:3.6.16-7.el8_8.4*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatlibtasn1-0:4.13-4.el8_8.1*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatgnutls-0:3.8.3-4.el9_4.6*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatgnutls-0:3.8.3-6.el9_6.4*
Red Hat OpenShift Container Platform 4.20RedHatrhcos-4.20.9.6.202607010620-0*
Red Hat OpenShift Container Platform 4.21RedHatrhcos-4.21.9.6.202607011303-0*
Red Hat OpenShift Container Platform 4.22RedHatrhcos-4.22.9.8.202606230855-0*
Red Hat AI Inference Server 3.2RedHatrhaiis/model-opt-cuda-rhel9:1782951051*
Red Hat AI Inference Server 3.2RedHatrhaiis/vllm-cuda-rhel9:1782951012*
Red Hat AI Inference Server 3.2RedHatrhaiis/vllm-rocm-rhel9:1782951244*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1782159791*
Red Hat Discovery 2RedHatdiscovery/discovery-ui-rhel9:1782166952*
Red Hat Hardened ImagesRedHatgnutls-main-3.8.13-1.hum1*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1781525684*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1781525671*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1781525693*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1781525739*
Gnutls28Ubuntuesm-infra-legacy/xenial*
Gnutls28Ubuntuesm-infra/bionic*
Gnutls28Ubuntuesm-infra/focal*
Gnutls28Ubuntuesm-infra/xenial*
Gnutls28Ubuntufips-preview/jammy*
Gnutls28Ubuntufips-updates/jammy*
Gnutls28Ubuntufips-updates/noble*
Gnutls28Ubuntujammy*
Gnutls28Ubuntunoble*
Gnutls28Ubuntuquesting*
Gnutls28Ubunturesolute*
Gnutls28Ubuntuupstream*

References

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