FKIE_CVE-2026-42009

Vulnerability from fkie_nvd - Published: 2026-05-18 13:16 - Updated: 2026-07-02 12:17
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:13274Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:20611Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:20612Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:20613Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:26319
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:26409
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:29197
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:29794
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:30004
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:30849
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:30850
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:32962
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:33125
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:34372
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-42009Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2467279Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-2
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:13274Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:20611Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:20612Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:20613Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26319
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26409
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:29197
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:29794
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30004
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30849
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30850
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:32962
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33125
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34372
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-42009Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2467279Issue Tracking, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42009.json
Impacted products
Vendor Product Version
gnu gnutls -
redhat hardened_images -
redhat openshift_container_platform 4.0
redhat enterprise_linux 6.0
redhat enterprise_linux 7.0
redhat enterprise_linux 8.0
redhat enterprise_linux 8.0
redhat enterprise_linux_for_els 8.10
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 9.0
redhat enterprise_linux 9.0
redhat enterprise_linux 9.8
redhat enterprise_linux_for_els 9.8
redhat enterprise_linux_for_els 9.8
redhat enterprise_linux_for_eus 9.8
redhat enterprise_linux_for_eus 9.8
redhat enterprise_linux_for_ibm_z_systems 9.0_s390x
redhat enterprise_linux_for_ibm_z_systems_els 9.8
redhat enterprise_linux_for_ibm_z_systems_eus 9.8
redhat enterprise_linux_for_power_little_endian 9.0_ppc64le
redhat enterprise_linux_for_power_little_endian_els 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
redhat enterprise_linux 10.0
redhat enterprise_linux 10.0
redhat enterprise_linux 10.2
redhat enterprise_linux 10.2
redhat enterprise_linux_for_els 10.2
redhat enterprise_linux_for_els 10.2
redhat enterprise_linux_for_eus 10.2
redhat enterprise_linux_for_eus 10.2
redhat enterprise_linux_for_ibm_z_systems 9.0_s390x
redhat enterprise_linux_for_ibm_z_systems 10.2
redhat enterprise_linux_for_ibm_z_systems_els 10.2
redhat enterprise_linux_for_ibm_z_systems_eus 10.2
redhat enterprise_linux_for_power_little_endian 10.0
redhat enterprise_linux_for_power_little_endian 10.2
redhat enterprise_linux_for_power_little_endian_els 10.2
redhat enterprise_linux_for_power_little_endian_eus 10.2
To clipboard 

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      "value": "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."
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  "id": "CVE-2026-42009",
  "lastModified": "2026-07-02T12:17:15.020",
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          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "userInteraction": "NONE",
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            {
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          "role": "CISA Coordinator",
          "timestamp": "2026-05-18T19:05:03.965288Z",
          "version": "2.0.3"
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  "published": "2026-05-18T13:16:32.707",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-475"
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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.