Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Gnutls | - |
| Redhat | Hardened Images | - |
| Redhat | Openshift Container Platform | 4.0 |
| Redhat | Enterprise Linux | 6.0 |
| Redhat | Enterprise Linux For Els | 8.10 |
| Redhat | Enterprise Linux For Ibm Z Systems | 8.0_s390x |
| Redhat | Enterprise Linux For Ibm Z Systems Els | 8.10 |
| Redhat | Enterprise Linux For Power Little Endian | 8.0_ppc64le |
| Redhat | Enterprise Linux For Power Little Endian Els | 8.10 |
| Redhat | Enterprise Linux For Eus | 9.8 |
| Redhat | Enterprise Linux For Ibm Z Systems Eus | 9.8 |
| Redhat | Enterprise Linux For Power Little Endian Eus | 9.8 |
| Redhat | Enterprise Linux For Update Services For Sap Solutions | 9.8 |
| Redhat | Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | 9.8 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:13274Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:20611Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:20612Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:20613Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:26319
- https://access.redhat.com/errata/RHSA-2026:26409
- https://access.redhat.com/errata/RHSA-2026:29197
- https://access.redhat.com/errata/RHSA-2026:29794
- https://access.redhat.com/errata/RHSA-2026:30004
- https://access.redhat.com/errata/RHSA-2026:30849
- https://access.redhat.com/errata/RHSA-2026:30850
- https://access.redhat.com/errata/RHSA-2026:32962
- https://access.redhat.com/errata/RHSA-2026:33125
- https://access.redhat.com/errata/RHSA-2026:34372
- https://access.redhat.com/errata/RHSA-2026:34764
FAQ
What is CVE-2026-42009?
CVE-2026-42009 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 pac...
How severe is CVE-2026-42009?
CVE-2026-42009 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42009?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Gnutls, Redhat Hardened Images, Redhat Openshift Container Platform, Redhat Enterprise Linux, Redhat Enterprise Linux For Els.