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net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME

🗓️ 15 Jul 2026 01:02:09Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 6 Views

Go net LookupCNAME with the cgo resolver allows denial of service from a long CNAME causing a double free crash.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.2aarch64yggdrasil0.4.9.2-1.el10_2yggdrasil-0.4.9.2-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leyggdrasil0.4.9.2-1.el10_2yggdrasil-0.4.9.2-1.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xyggdrasil0.4.9.2-1.el10_2yggdrasil-0.4.9.2-1.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64yggdrasil0.4.9.2-1.el10_2yggdrasil-0.4.9.2-1.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64yggdrasil-debuginfo0.4.9.2-1.el10_2yggdrasil-debuginfo-0.4.9.2-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leyggdrasil-debuginfo0.4.9.2-1.el10_2yggdrasil-debuginfo-0.4.9.2-1.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xyggdrasil-debuginfo0.4.9.2-1.el10_2yggdrasil-debuginfo-0.4.9.2-1.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64yggdrasil-debuginfo0.4.9.2-1.el10_2yggdrasil-debuginfo-0.4.9.2-1.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64yggdrasil-debugsource0.4.9.2-1.el10_2yggdrasil-debugsource-0.4.9.2-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leyggdrasil-debugsource0.4.9.2-1.el10_2yggdrasil-debugsource-0.4.9.2-1.el10_2.ppc64le.rpm
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22 Jul 2026 09:26Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.17.5
EPSS0.00813
SSVC
6