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CVE-2026-42009— Gnutls: gnutls: denial of service via dtls packet reordering vulnerability

CVSS 7.5 · High EPSS 0.25% · P48

Affected Version Matrix 8

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 10anyaffected
Red HatRed Hat Enterprise Linux 6anyaffected
Red HatRed Hat Enterprise Linux 7anyaffected
Red HatRed Hat Enterprise Linux 80:3.6.16-8.el8_10.6< *unaffected
0:3.6.16-8.el8_10.6< *unaffected
Red HatRed Hat Enterprise Linux 9anyaffected
Red HatRed Hat Hardened Images3.8.13-1.hum1< *unaffected
Red HatRed Hat OpenShift Container Platform 4anyaffected
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I. Basic Information for CVE-2026-42009

Vulnerability Information
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Vulnerability Title
Gnutls: gnutls: denial of service via dtls packet reordering vulnerability
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
从输入到API的未定义行为
Source: NVD (National Vulnerability Database)
Vulnerability Title
GnuTLS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GnuTLS是GnuTLS开源的一款免费的用于实现SSL、TLS和DTLS协议的安全通信库。 gnutls存在安全漏洞，该漏洞源于Datagram Transport Layer Security数据包重排序逻辑问题，可能导致远程攻击者利用比较函数未正确处理重复序列号的数据包，造成不稳定数据包排序或未定义行为，导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red HatRed Hat Hardened Images 3.8.13-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-42009

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III. Intelligence Information for CVE-2026-42009

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Vendor Advisories for CVE-2026-42009 (3)

Other References for CVE-2026-42009 (1)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-475

V. Comments for CVE-2026-42009

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