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

🗓️ 04 Jun 2026 12:39:22Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 3 Views

Go net package LookupCNAME with cgo resolver may crash from long CNAMEs, causing denial of service.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Hardened Imagesanyaarch64golang1.251.25.11-2.hum1golang1.25-1.25.11-2.hum1.aarch64.rpm
Red Hat Hardened Imagesanyx86_64golang1.251.25.11-2.hum1golang1.25-1.25.11-2.hum1.x86_64.rpm
Red Hat Hardened Imagesanynoarchgolang1.25-docs1.25.11-2.hum1golang1.25-docs-1.25.11-2.hum1.noarch.rpm

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20 Jul 2026 00:25Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.17.5
EPSS0.00813
SSVC
3