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

🗓️ 16 Jul 2026 14:35:59Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 13 Views

Go net.LookupCNAME with the cgo resolver is vulnerable to long CNAME replies causing a memory double free and crash.

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Red Hat Enterprise Linux9aarch64flightctl-agent1.1.3-1.el9emflightctl-agent-1.1.3-1.el9em.aarch64.rpm
Red Hat Enterprise Linux9ppc64leflightctl-agent1.1.3-1.el9emflightctl-agent-1.1.3-1.el9em.ppc64le.rpm
Red Hat Enterprise Linux9s390xflightctl-agent1.1.3-1.el9emflightctl-agent-1.1.3-1.el9em.s390x.rpm
Red Hat Enterprise Linux9x86_64flightctl-agent1.1.3-1.el9emflightctl-agent-1.1.3-1.el9em.x86_64.rpm
Red Hat Enterprise Linux10aarch64flightctl-agent1.1.3-1.el10emflightctl-agent-1.1.3-1.el10em.aarch64.rpm
Red Hat Enterprise Linux10ppc64leflightctl-agent1.1.3-1.el10emflightctl-agent-1.1.3-1.el10em.ppc64le.rpm
Red Hat Enterprise Linux10s390xflightctl-agent1.1.3-1.el10emflightctl-agent-1.1.3-1.el10em.s390x.rpm
Red Hat Enterprise Linux10x86_64flightctl-agent1.1.3-1.el10emflightctl-agent-1.1.3-1.el10em.x86_64.rpm
Red Hat Enterprise Linux9aarch64flightctl-cli1.1.3-1.el9emflightctl-cli-1.1.3-1.el9em.aarch64.rpm
Red Hat Enterprise Linux9ppc64leflightctl-cli1.1.3-1.el9emflightctl-cli-1.1.3-1.el9em.ppc64le.rpm
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21 Aug 2026 17:47Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.17.5
EPSS0.00813
SSVC
13