Gnutls: gnutls: denial of service via dtls packet reordering vulnerability
Summary
| CVE | CVE-2026-42009 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-18 13:16:32 UTC |
| Updated | 2026-07-23 12:17:54 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.004860000 probability, percentile 0.657850000 (date 2026-06-08)
Problem Types: CWE-475 | CWE-475 Undefined Behavior for Input to API
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Gnu | Gnutls | - | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 6.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 8.10 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 8.10 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Els | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Eus | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Eus | 10.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Eus | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Eus | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems | 8.0_s390x | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems | 9.0_s390x | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems Els | 8.10 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems Els | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems Eus | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian | 8.0_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian | 9.0_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian Els | 8.10 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian Els | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian Eus | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Update Services For Sap Solutions | 9.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | 9.8 | All | All | All |
| Application | Redhat | Hardened Images | - | All | All | All |
| Application | Redhat | Openshift Container Platform | 4.0 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:3.8.10-4.el10_2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:3.8.9-9.el10_0.19 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:3.3.29-9.el7_9.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:3.6.16-8.el8_10.6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:3.6.16-8.el8_10.6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:3.6.14-10.el8_4.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:4.13-3.el8_4.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:3.6.14-10.el8_4.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:4.13-3.el8_4.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:3.6.16-5.el8_6.5 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:4.13-3.el8_6.2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | unaffected 0:3.6.16-5.el8_6.5 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | unaffected 0:4.13-3.el8_6.2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:3.6.16-7.el8_8.4 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:4.13-4.el8_8.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 0:3.6.16-7.el8_8.4 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 0:4.13-4.el8_8.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:3.8.10-4.el9_8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:3.8.10-4.el9_8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 0:3.7.6-21.el9_2.7 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions | unaffected 0:3.8.3-4.el9_4.6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:3.8.3-6.el9_6.4 * rpm | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4.19 | unaffected 4.19.9.6.202607151909-0 * rpm | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4.20 | unaffected 4.20.9.6.202607010620-0 * rpm | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4.21 | unaffected 4.21.9.6.202607011303-0 * rpm | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4.22 | unaffected 4.22.9.8.202606230855-0 * rpm | Not specified |
| CNA | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951051 * rpm | Not specified |
| CNA | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951012 * rpm | Not specified |
| CNA | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951244 * rpm | Not specified |
| CNA | Red Hat | Red Hat Discovery 2 | unaffected 1782159791 * rpm | Not specified |
| CNA | Red Hat | Red Hat Discovery 2 | unaffected 1782166952 * rpm | Not specified |
| CNA | Red Hat | Red Hat Hardened Images | unaffected 3.8.13-1.hum1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525684 * rpm | Not specified |
| CNA | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525671 * rpm | Not specified |
| CNA | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525693 * rpm | Not specified |
| CNA | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525739 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:3.8.10-4.el10_2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:3.8.9-9.el10_0.19 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:3.3.29-9.el7_9.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:3.6.16-8.el8_10.6 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:3.6.14-10.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:4.13-3.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:3.6.14-10.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:4.13-3.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:3.6.16-5.el8_6.5 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:4.13-3.el8_6.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | unaffected 0:3.6.16-5.el8_6.5 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | unaffected 0:4.13-3.el8_6.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:3.6.16-7.el8_8.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:4.13-4.el8_8.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 0:3.6.16-7.el8_8.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 0:4.13-4.el8_8.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:3.8.10-4.el9_8 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 0:3.7.6-21.el9_2.7 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions | unaffected 0:3.8.3-4.el9_4.6 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:3.8.3-6.el9_6.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.19 | unaffected 4.19.9.6.202607151909-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.20 | unaffected 4.20.9.6.202607010620-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.21 | unaffected 4.21.9.6.202607011303-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.22 | unaffected 4.22.9.8.202606230855-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951051 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951012 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1782951244 * rpm | Not specified |
| ADP | Red Hat | Red Hat Discovery 2 | unaffected 1782159791 * rpm | Not specified |
| ADP | Red Hat | Red Hat Discovery 2 | unaffected 1782166952 * rpm | Not specified |
| ADP | Red Hat | Red Hat Hardened Images | unaffected 3.8.13-1.hum1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525684 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525671 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525693 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1781525739 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:30004 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36004 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:30849 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42009.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34764 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20611 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:13274 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:20613 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:36006 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:26319 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.gnutls.org/security-new.html | [email protected] | www.gnutls.org | |
| access.redhat.com/errata/RHSA-2026:32962 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20612 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:34372 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:29197 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:29794 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:41921 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-42009 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:40762 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:33125 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36005 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:26409 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:30850 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34788 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Red Hat would like to thank Joshua Rogers (AISLE Research Team) for reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-06T16:32:32.382Z | Reported to Red Hat. |
| CNA | 2026-04-29T00:00:00.000Z | Made public. |
| ADP | 2026-05-06T16:32:32.382Z | Reported to Red Hat. |
| ADP | 2026-04-29T00:00:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:34372: Red Hat Enterprise Linux Server (v. 7 ELS)
ADP: RHSA-2026:40762: Red Hat OpenShift Container Platform 4.19
ADP: RHSA-2026:34788: Red Hat OpenShift Container Platform 4.20
ADP: RHSA-2026:34764: Red Hat OpenShift Container Platform 4.21
ADP: RHSA-2026:29794: Red Hat OpenShift Container Platform 4.22
ADP: RHSA-2026:26409: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
ADP: RHSA-2026:20613: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)
ADP: RHSA-2026:20611: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8)
ADP: RHSA-2026:33125: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
ADP: RHSA-2026:30849: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6), Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
ADP: RHSA-2026:30850: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8), Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)
ADP: RHSA-2026:41921: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:32962: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4)
ADP: RHSA-2026:30004: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)
ADP: RHSA-2026:20612: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9)
ADP: RHSA-2026:36004: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:36005: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:36006: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:29197: Red Hat Discovery 2
ADP: RHSA-2026:13274: Red Hat Hardened Images
ADP: RHSA-2026:26319: Red Hat Update Infrastructure 5