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dnsmasq: Broken ECS source validation bypass

🗓️ 19 May 2026 21:55:17Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

Dnsmasq ECS validation bypass occurs when option record length is used instead of full packet length.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64dnsmasq0:2.85-18.el9_8.1dnsmasq-0:2.85-18.el9_8.1.aarch64.rpm
Red Hat Enterprise Linux9ppc64lednsmasq0:2.85-18.el9_8.1dnsmasq-0:2.85-18.el9_8.1.ppc64le.rpm
Red Hat Enterprise Linux9s390xdnsmasq0:2.85-18.el9_8.1dnsmasq-0:2.85-18.el9_8.1.s390x.rpm
Red Hat Enterprise Linux9x86_64dnsmasq0:2.85-18.el9_8.1dnsmasq-0:2.85-18.el9_8.1.x86_64.rpm
Red Hat Enterprise Linux9aarch64dnsmasq-debuginfo0:2.85-18.el9_8.1dnsmasq-debuginfo-0:2.85-18.el9_8.1.aarch64.rpm
Red Hat Enterprise Linux9ppc64lednsmasq-debuginfo0:2.85-18.el9_8.1dnsmasq-debuginfo-0:2.85-18.el9_8.1.ppc64le.rpm
Red Hat Enterprise Linux9s390xdnsmasq-debuginfo0:2.85-18.el9_8.1dnsmasq-debuginfo-0:2.85-18.el9_8.1.s390x.rpm
Red Hat Enterprise Linux9x86_64dnsmasq-debuginfo0:2.85-18.el9_8.1dnsmasq-debuginfo-0:2.85-18.el9_8.1.x86_64.rpm
Red Hat Enterprise Linux9aarch64dnsmasq-debugsource0:2.85-18.el9_8.1dnsmasq-debugsource-0:2.85-18.el9_8.1.aarch64.rpm
Red Hat Enterprise Linux9ppc64lednsmasq-debugsource0:2.85-18.el9_8.1dnsmasq-debugsource-0:2.85-18.el9_8.1.ppc64le.rpm
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26 May 2026 08:59Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.3
EPSS0.00027
SSVC
4