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

🗓️ 08 Jul 2026 15:52:29Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 5 Views

Go net.LookupCNAME with cgo resolver may crash via long canonical name response causing double-free DoS.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64flightctl-agent1.0.3-1.el9.emflightctl-agent-1.0.3-1.el9.em.aarch64.rpm
Red Hat Enterprise Linux9ppc64leflightctl-agent1.0.3-1.el9.emflightctl-agent-1.0.3-1.el9.em.ppc64le.rpm
Red Hat Enterprise Linux9s390xflightctl-agent1.0.3-1.el9.emflightctl-agent-1.0.3-1.el9.em.s390x.rpm
Red Hat Enterprise Linux9x86_64flightctl-agent1.0.3-1.el9.emflightctl-agent-1.0.3-1.el9.em.x86_64.rpm
Red Hat Enterprise Linux9aarch64flightctl-cli1.0.3-1.el9.emflightctl-cli-1.0.3-1.el9.em.aarch64.rpm
Red Hat Enterprise Linux9ppc64leflightctl-cli1.0.3-1.el9.emflightctl-cli-1.0.3-1.el9.em.ppc64le.rpm
Red Hat Enterprise Linux9s390xflightctl-cli1.0.3-1.el9.emflightctl-cli-1.0.3-1.el9.em.s390x.rpm
Red Hat Enterprise Linux9x86_64flightctl-cli1.0.3-1.el9.emflightctl-cli-1.0.3-1.el9.em.x86_64.rpm
Red Hat Enterprise Linux9noarchflightctl-selinux1.0.3-1.el9.emflightctl-selinux-1.0.3-1.el9.em.noarch.rpm

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25 Jul 2026 18:38Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.00813
SSVC
5