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High 7.5Published May 18, 2026
CVE-2026-42009Gnutls: gnutls: denial of service via dtls packet reordering vulnerability
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 10 and 27 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-475
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.8.10-4.el10_2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:3.8.9-9.el10_0.19 not affected | CNA record |
from 0:3.3.29-9.el7_9.1 not affected | CNA record | |
from 0:3.6.14-10.el8_4.1 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life | from 0:3.6.14-10.el8_4.1 not affected | CNA record |
from 0:3.6.16-7.el8_8.4 not affected | CNA record | |
from 0:3.6.16-7.el8_8.4 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:3.8.3-6.el9_6.4 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CNA record |
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 redhat:cert_manager | from 1791371080 not affected | CNA record |
Red Hat Red Hat AI Inference Server 3.2 redhat:ai_inference_server | from 1782951051 not affected | CNA record |
Red Hat Red Hat Discovery 2 redhat:discovery | from 1782159791 not affected | CNA record |
Red Hat Red Hat Hardened Images redhat:hummingbird | from 3.8.13-1.hum1 not affected | CNA record |
Red Hat Red Hat OpenShift AI 3.4 redhat:openshift_ai | from 1790703542 not affected | CNA record |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1781525684 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.8.10-4.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:3.8.9-9.el10_0.19 not affected | CISA ADP |
from 0:3.3.29-9.el7_9.1 not affected | CISA ADP | |
from 0:3.6.14-10.el8_4.1 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:3.6.14-10.el8_4.1 not affected | CISA ADP |
from 0:3.6.16-7.el8_8.4 not affected | CISA ADP | |
from 0:3.6.16-7.el8_8.4 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:3.8.3-6.el9_6.4 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CISA ADP |
Red Hat Red Hat AI Inference Server 3.2 redhat:ai_inference_server | from 1782951051 not affected | CISA ADP |
Red Hat Red Hat Discovery 2 redhat:discovery | from 1782159791 not affected | CISA ADP |
Red Hat Red Hat Hardened Images redhat:hummingbird | from 3.8.13-1.hum1 not affected | CISA ADP |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1781525684 not affected | CISA ADP |
gnu gnutls gnu:gnutls | all versions | NVD |
redhat hardened_images redhat:hardened_images | all versions | NVD |
redhat openshift_container_platform redhat:openshift_container_platform | 4.0 | NVD |
redhat enterprise_linux redhat:enterprise_linux | 6.0; 7.0; 8.0; 8.0; 9.0; 9.0; 9.8; 10.0; and 3 more ranges | NVD |
redhat enterprise_linux_for_els redhat:enterprise_linux_for_els | 8.10; 8.10; 9.8; 9.8; 10.2; 10.2 | NVD |
redhat enterprise_linux_for_ibm_z_systems redhat:enterprise_linux_for_ibm_z_systems | 8.0_s390x; 9.0_s390x; 9.0_s390x; 10.2 | NVD |
redhat enterprise_linux_for_ibm_z_systems_els redhat:enterprise_linux_for_ibm_z_systems_els | 8.10; 9.8; 10.2 | NVD |
redhat enterprise_linux_for_power_little_endian redhat:enterprise_linux_for_power_little_endian | 8.0_ppc64le; 9.0_ppc64le; 10.0; 10.2 | NVD |
redhat enterprise_linux_for_power_little_endian_els redhat:enterprise_linux_for_power_little_endian_els | 8.10; 9.8; 10.2 | NVD |
redhat enterprise_linux_for_eus redhat:enterprise_linux_for_eus | 9.8; 9.8; 10.2; 10.2 | NVD |
redhat enterprise_linux_for_ibm_z_systems_eus redhat:enterprise_linux_for_ibm_z_systems_eus | 9.8; 10.2 | NVD |
redhat enterprise_linux_for_power_little_endian_eus redhat:enterprise_linux_for_power_little_endian_eus | 9.8; 10.2 | NVD |
redhat enterprise_linux_for_update_services_for_sap_solutions redhat:enterprise_linux_for_update_services_for_sap_solutions | 9.8 | NVD |
redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions | 9.8 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:13274vendor-advisory, x-refsource-redhat, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:20611vendor-advisory, x-refsource-redhat, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:20612vendor-advisory, x-refsource-redhat, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:20613vendor-advisory, x-refsource-redhat, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:26319vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26409vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29197vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29794vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30004vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30849vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30850vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:32962vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:33125vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:34372vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:34764vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:34788vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:36004vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:36005vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:36006vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:40762vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:41921vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56786vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56853vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56911vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:57483vendor-advisory, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.