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

🗓️ 06 Aug 2026 18:23:44Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 16 Views

Go net.LookupCNAME with cgo resolver exploits long CNAME to crash via double-free DoS.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.0aarch64yggdrasil0.4.7-5.el10_0yggdrasil-0.4.7-5.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0ppc64leyggdrasil0.4.7-5.el10_0yggdrasil-0.4.7-5.el10_0.ppc64le.rpm
Red Hat Enterprise Linux10.0s390xyggdrasil0.4.7-5.el10_0yggdrasil-0.4.7-5.el10_0.s390x.rpm
Red Hat Enterprise Linux10.0x86_64yggdrasil0.4.7-5.el10_0yggdrasil-0.4.7-5.el10_0.x86_64.rpm
Red Hat Enterprise Linux10.0aarch64yggdrasil-debuginfo0.4.7-5.el10_0yggdrasil-debuginfo-0.4.7-5.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0ppc64leyggdrasil-debuginfo0.4.7-5.el10_0yggdrasil-debuginfo-0.4.7-5.el10_0.ppc64le.rpm
Red Hat Enterprise Linux10.0s390xyggdrasil-debuginfo0.4.7-5.el10_0yggdrasil-debuginfo-0.4.7-5.el10_0.s390x.rpm
Red Hat Enterprise Linux10.0x86_64yggdrasil-debuginfo0.4.7-5.el10_0yggdrasil-debuginfo-0.4.7-5.el10_0.x86_64.rpm
Red Hat Enterprise Linux10.0aarch64yggdrasil-debugsource0.4.7-5.el10_0yggdrasil-debugsource-0.4.7-5.el10_0.aarch64.rpm
Red Hat Enterprise Linux10.0ppc64leyggdrasil-debugsource0.4.7-5.el10_0yggdrasil-debugsource-0.4.7-5.el10_0.ppc64le.rpm
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18 Aug 2026 21:40Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.17.5
EPSS0.00813
SSVC
16