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

🗓️ 26 Aug 2026 15:45:29Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 5 Views

Double-free in Go net LookupCNAME via long CNAME response causes DoS with cgo resolver.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8aarch64butane0.20.0-6.rhaos4.15.el8butane-0.20.0-6.rhaos4.15.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lebutane0.20.0-6.rhaos4.15.el8butane-0.20.0-6.rhaos4.15.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xbutane0.20.0-6.rhaos4.15.el8butane-0.20.0-6.rhaos4.15.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64butane0.20.0-6.rhaos4.15.el8butane-0.20.0-6.rhaos4.15.el8.x86_64.rpm
Red Hat Enterprise Linux8aarch64butane-debuginfo0.20.0-6.rhaos4.15.el8butane-debuginfo-0.20.0-6.rhaos4.15.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lebutane-debuginfo0.20.0-6.rhaos4.15.el8butane-debuginfo-0.20.0-6.rhaos4.15.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xbutane-debuginfo0.20.0-6.rhaos4.15.el8butane-debuginfo-0.20.0-6.rhaos4.15.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64butane-debuginfo0.20.0-6.rhaos4.15.el8butane-debuginfo-0.20.0-6.rhaos4.15.el8.x86_64.rpm
Red Hat Enterprise Linux8aarch64butane-debugsource0.20.0-6.rhaos4.15.el8butane-debugsource-0.20.0-6.rhaos4.15.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lebutane-debugsource0.20.0-6.rhaos4.15.el8butane-debugsource-0.20.0-6.rhaos4.15.el8.ppc64le.rpm
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27 Aug 2026 16:44Current
7High risk
Vulners AI Score7
CVSS 3.17.5
EPSS0.00813
SSVC
5