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

🗓️ 04 Aug 2026 18:10:56Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 13 Views

Go net.LookupCNAME with cgo resolver crashes on long CNAMEs, causing denial of service.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8aarch64automation-gateway-proxy-server2.5.10-7.el8apautomation-gateway-proxy-server-2.5.10-7.el8ap.aarch64.rpm
Red Hat Enterprise Linux8ppc64leautomation-gateway-proxy-server2.5.10-7.el8apautomation-gateway-proxy-server-2.5.10-7.el8ap.ppc64le.rpm
Red Hat Enterprise Linux8s390xautomation-gateway-proxy-server2.5.10-7.el8apautomation-gateway-proxy-server-2.5.10-7.el8ap.s390x.rpm
Red Hat Enterprise Linux8x86_64automation-gateway-proxy-server2.5.10-7.el8apautomation-gateway-proxy-server-2.5.10-7.el8ap.x86_64.rpm
Red Hat Enterprise Linux9aarch64automation-gateway-proxy-server2.6.17-2.el9apautomation-gateway-proxy-server-2.6.17-2.el9ap.aarch64.rpm
Red Hat Enterprise Linux9ppc64leautomation-gateway-proxy-server2.6.17-2.el9apautomation-gateway-proxy-server-2.6.17-2.el9ap.ppc64le.rpm
Red Hat Enterprise Linux9s390xautomation-gateway-proxy-server2.6.17-2.el9apautomation-gateway-proxy-server-2.6.17-2.el9ap.s390x.rpm
Red Hat Enterprise Linux9x86_64automation-gateway-proxy-server2.6.17-2.el9apautomation-gateway-proxy-server-2.6.17-2.el9ap.x86_64.rpm

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22 Aug 2026 20:13Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.17.5
EPSS0.00813
SSVC
13