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 | 2026-06-08 17:16:36 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 [email protected]
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 | [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 | 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
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS: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 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 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 Hardened Images | unaffected 3.8.13-1.hum1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:13274 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/security/cve/CVE-2026-42009 | [email protected] | access.redhat.com | Third Party Advisory |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:20612 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:20613 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:20611 | [email protected] | access.redhat.com | Third Party Advisory |
| 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. |
There are currently no legacy QID mappings associated with this CVE.