CVE-2026-42009Suited to automated attack · CISA

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

CVSS score

7.5

EPSS probability

%1.1

Risk score

0.1

Published

5 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

DayBreach CVE AI Research

CVE-2026-42009 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-42009 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	redhat	gnutls	View
2	Red Hat	Red Hat Enterprise Linux 10	View
3	Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	View
4	Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	View
5	Red Hat	Red Hat Enterprise Linux 8	View
6	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	View
7	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	View
8	Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	View
9	Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	View
10	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	View
11	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	View
12	Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	View
13	Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	View
14	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	View
15	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	View
16	Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	View
17	Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	View
18	Red Hat	Red Hat Enterprise Linux 9	View
19	Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	View
20	Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	View
21	Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	View
22	Red Hat	Red Hat OpenShift Container Platform 4.12	View
23	Red Hat	Red Hat OpenShift Container Platform 4.13	View
24	Red Hat	Red Hat OpenShift Container Platform 4.14	View
25	Red Hat	Red Hat OpenShift Container Platform 4.15	View
26	Red Hat	Red Hat OpenShift Container Platform 4.16	View
27	Red Hat	Red Hat OpenShift Container Platform 4.17	View
28	Red Hat	Red Hat OpenShift Container Platform 4.18	View
29	Red Hat	Red Hat OpenShift Container Platform 4.19	View
30	Red Hat	Red Hat OpenShift Container Platform 4.20	View
31	Red Hat	Red Hat OpenShift Container Platform 4.21	View
32	Red Hat	Red Hat OpenShift Container Platform 4.22	View
33	Red Hat	Cert Manager support for Red Hat OpenShift release 1.17	View
34	Red Hat	Cert Manager support for Red Hat OpenShift release 1.17	View
35	Red Hat	Cert Manager support for Red Hat OpenShift release 1.17	View
36	Red Hat	Cert Manager support for Red Hat OpenShift release 1.17	View
37	Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	View
38	Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	View
39	Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	View
40	Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	View
41	Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	View
42	Red Hat	Cert Manager support for Red Hat OpenShift release 1.20	View
43	Red Hat	Red Hat AI Inference Server 3.2	View
44	Red Hat	Red Hat AI Inference Server 3.2	View
45	Red Hat	Red Hat AI Inference Server 3.2	View
46	Red Hat	Red Hat Discovery 2	View
47	Red Hat	Red Hat Discovery 2	View
48	Red Hat	Red Hat Hardened Images	View
49	Red Hat	Red Hat OpenShift AI 3.4	View
50	Red Hat	Red Hat Update Infrastructure 5	View
51	Red Hat	Red Hat Update Infrastructure 5	View
52	Red Hat	Red Hat Update Infrastructure 5	View
53	Red Hat	Red Hat Update Infrastructure 5	View
54	Red Hat	Red Hat Update Infrastructure 5	View
55	Red Hat	Red Hat Update Infrastructure 5	View
56	Red Hat	Red Hat Update Infrastructure 5	View
57	Red Hat	Red Hat Enterprise Linux 6	View
58	Red Hat	Red Hat OpenShift Container Platform 4	View
59	gnu	gnutls	View
60	redhat	hardened images	View
61	redhat	openshift container platform	View
62	redhat	enterprise linux	View
63	redhat	enterprise linux	View
64	redhat	enterprise linux	View
65	redhat	enterprise linux for els	View
66	redhat	enterprise linux for ibm z systems	View
67	redhat	enterprise linux for ibm z systems els	View
68	redhat	enterprise linux for power little endian	View
69	redhat	enterprise linux for power little endian els	View
70	redhat	enterprise linux	View
71	redhat	enterprise linux	View
72	redhat	enterprise linux for els	View
73	redhat	enterprise linux for eus	View
74	redhat	enterprise linux for ibm z systems	View
75	redhat	enterprise linux for ibm z systems els	View
76	redhat	enterprise linux for ibm z systems eus	View
77	redhat	enterprise linux for power little endian	View
78	redhat	enterprise linux for power little endian els	View
79	redhat	enterprise linux for power little endian eus	View
80	redhat	enterprise linux for update services for sap solutions	View
81	redhat	enterprise linux server for power little endian update services for sap solutions	View
82	redhat	enterprise linux	View
83	redhat	enterprise linux	View
84	redhat	enterprise linux for els	View
85	redhat	enterprise linux for eus	View
86	redhat	enterprise linux for ibm z systems	View
87	redhat	enterprise linux for ibm z systems els	View
88	redhat	enterprise linux for ibm z systems eus	View
89	redhat	enterprise linux for power little endian	View
90	redhat	enterprise linux for power little endian	View
91	redhat	enterprise linux for power little endian els	View
92	redhat	enterprise linux for power little endian eus	View

Total affected vendors: 3|Products: 92

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
7.5	CVSS 3.x	—	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:R	Microsoft MSRC
7.5	CVSS V3_1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CVE CNA
7.5	CVSS V3_1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CVE ADP
7.5	CVSS V31	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

reference

Yama veya çözüm referansı

Open source

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-42009 is associated with the following CWEs:

CWE-475: Common Weakness Enumeration Entry CWE-475

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-42009 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

RHSA-2026:13274vendor-advisory RHSA-2026:20611vendor-advisory RHSA-2026:20612vendor-advisory RHSA-2026:20613vendor-advisory RHSA-2026:26319vendor-advisory RHSA-2026:26409vendor-advisory RHSA-2026:29197vendor-advisory RHSA-2026:29794vendor-advisory RHSA-2026:30004vendor-advisory RHSA-2026:30849vendor-advisory

CVSS Vector Radar Chart

7.5 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama doğrulandı

1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

redhat

Red Hat

gnu

Weakness Type (CWE & CAPEC)

CWE-475

Similar Vulnerabilities

9.8

CVE-2024-23897 Actively exploitedjenkins: Arbitrary file read vulnerability through the CLI can lead to RCE

VendorRed Hat Productred_hat_openshift_container_platform_3.11:jenkins+9 etkilenen

Partial patch Public Exploits:10EPSS %1002 y ago

9.8

CVE-2022-22963 Actively exploitedspring-cloud-function: Remote code execution by malicious Spring Expression

VendorRed Hat Product8Base-Openshift-Serverless-1.21:openshift-serverless-1/client-kn-rhel8@sha256:2199a60cb46225b1551c0882fa0694fa846df5d6e3246f7cfbf6ddf5b55f6b5f_ppc64le+9 etkilenen

Patch verified Public Exploits:11EPSS %1004 y ago

9.8

CVE-2023-46604 Actively exploitedactivemq-openwire: OpenWire Module: Unbounded deserialization causes ActiveMQ to be vulnerable to a remote code execution (RCE) attack

VendorRed Hat Productred_hat_jboss_fuse_service_works_6:activemq-openwire+8 etkilenen

Partial patch Public Exploits:9EPSS %1003 y ago

9.8

CVE-2020-16846 Actively exploitedsalt: sending crafted web requests to the Salt API, with the SSH client enabled, can result in shell injection

VendorRed Hat Productred_hat_ceph_storage_2:salt+3 etkilenen

No patch (vendor) Public Exploits:2EPSS %1006 y ago

9.8

CVE-2026-24061 Actively exploitedVulnerability in GNU Inetutils

Vendorgnu ProductInetUtils+2 etkilenen

Patch verified Public Exploits:2EPSS %999 mo ago

9.8

CVE-2012-4681 Actively exploitedVulnerability in N/a

Vendorn/a Productn/a+8 etkilenen

Workaround Public Exploits:3EPSS %9914 y ago

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

Get a free key Documentation

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-42009"