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

🗓️ 08 Jul 2026 09:19:18Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

Go net package LookupCNAME with cgo resolver may crash from long CNAME response, causing DoS.

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Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64oci-seccomp-bpf-hook0:1.2.11-2.el9_8oci-seccomp-bpf-hook-0:1.2.11-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64leoci-seccomp-bpf-hook0:1.2.11-2.el9_8oci-seccomp-bpf-hook-0:1.2.11-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xoci-seccomp-bpf-hook0:1.2.11-2.el9_8oci-seccomp-bpf-hook-0:1.2.11-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64oci-seccomp-bpf-hook0:1.2.11-2.el9_8oci-seccomp-bpf-hook-0:1.2.11-2.el9_8.x86_64.rpm
Red Hat Enterprise Linux9aarch64oci-seccomp-bpf-hook-debuginfo0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debuginfo-0:1.2.11-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64leoci-seccomp-bpf-hook-debuginfo0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debuginfo-0:1.2.11-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xoci-seccomp-bpf-hook-debuginfo0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debuginfo-0:1.2.11-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64oci-seccomp-bpf-hook-debuginfo0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debuginfo-0:1.2.11-2.el9_8.x86_64.rpm
Red Hat Enterprise Linux9aarch64oci-seccomp-bpf-hook-debugsource0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debugsource-0:1.2.11-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64leoci-seccomp-bpf-hook-debugsource0:1.2.11-2.el9_8oci-seccomp-bpf-hook-debugsource-0:1.2.11-2.el9_8.ppc64le.rpm
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13 Jul 2026 11:04Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.00813
SSVC
4