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CVE-2026-42009

HIGHCVSS 7.5/10EPSS 1.23%

Last modified

CVE-2026-42009 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
1.23%

65.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GnuGnutlsAll versions
RedhatHardened ImagesAll versions
RedhatOpenshift Container Platform4.0
RedhatEnterprise Linux6.0
RedhatEnterprise Linux7.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux For Els8.10
RedhatEnterprise Linux For Ibm Z Systems8.0_s390x
RedhatEnterprise Linux For Ibm Z Systems Els8.10
RedhatEnterprise Linux For Power Little Endian8.0_ppc64le
RedhatEnterprise Linux For Power Little Endian Els8.10
RedhatEnterprise Linux9.0
RedhatEnterprise Linux9.8
RedhatEnterprise Linux For Els9.8
RedhatEnterprise Linux For Eus9.8
RedhatEnterprise Linux For Ibm Z Systems9.0_s390x
RedhatEnterprise Linux For Ibm Z Systems Els9.8
RedhatEnterprise Linux For Ibm Z Systems Eus9.8
RedhatEnterprise Linux For Power Little Endian9.0_ppc64le
RedhatEnterprise Linux For Power Little Endian Els9.8
RedhatEnterprise Linux For Power Little Endian Eus9.8
RedhatEnterprise Linux For Update Services For Sap Solutions9.8
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions9.8
RedhatEnterprise Linux10.0
RedhatEnterprise Linux10.2
RedhatEnterprise Linux For Els10.2
RedhatEnterprise Linux For Eus10.2
RedhatEnterprise Linux For Ibm Z Systems10.2
RedhatEnterprise Linux For Ibm Z Systems Els10.2
RedhatEnterprise Linux For Ibm Z Systems Eus10.2
RedhatEnterprise Linux For Power Little Endian10.0
RedhatEnterprise Linux For Power Little Endian10.2
RedhatEnterprise Linux For Power Little Endian Els10.2
RedhatEnterprise Linux For Power Little Endian Eus10.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2026-42009?
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.
How severe is CVE-2026-42009?
CVE-2026-42009 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.
How do I fix CVE-2026-42009?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42009?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST