Gnutls: gnutls: denial of service via dtls packet reordering vulnerability

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Summary

CVECVE-2026-42009
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-18 13:16:32 UTC
Updated2026-06-01 21:16:44 UTC
DescriptionA 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: 0.002470000 probability, percentile 0.481250000 (date 2026-05-31)

Problem Types: CWE-475 | CWE-475 Undefined Behavior for Input to API

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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 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 Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:13274 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-42009 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:20613 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20611 [email protected] 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

SourceTimeEvent
CNA2026-05-06T16:32:32.382ZReported to Red Hat.
CNA2026-04-29T00:00:00.000ZMade public.
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