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

🗓️ 21 Oct 2026 18:36:18Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

DoS in Go net package LookupCNAME via long CNAME response using cgo DNS resolver.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.6x86_64delve1.26.1-1.module+el8.6.0+24782+a062e766delve-1.26.1-1.module+el8.6.0+24782+a062e766.x86_64.rpm
Red Hat Enterprise Linux8.6x86_64delve-debuginfo1.26.1-1.module+el8.6.0+24782+a062e766delve-debuginfo-1.26.1-1.module+el8.6.0+24782+a062e766.x86_64.rpm
Red Hat Enterprise Linux8.6x86_64delve-debugsource1.26.1-1.module+el8.6.0+24782+a062e766delve-debugsource-1.26.1-1.module+el8.6.0+24782+a062e766.x86_64.rpm
Red Hat Enterprise Linux8.6x86_64go-toolset1.26.10-4.module+el8.6.0+25114+90ecdb41go-toolset-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64.rpm
Red Hat Enterprise Linux8.6x86_64golang1.26.10-4.module+el8.6.0+25114+90ecdb41golang-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64.rpm
Red Hat Enterprise Linux8.6x86_64golang-bin1.26.10-4.module+el8.6.0+25114+90ecdb41golang-bin-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64.rpm
Red Hat Enterprise Linux8.6noarchgolang-docs1.26.10-4.module+el8.6.0+25114+90ecdb41golang-docs-1.26.10-4.module+el8.6.0+25114+90ecdb41.noarch.rpm
Red Hat Enterprise Linux8.6noarchgolang-misc1.26.10-4.module+el8.6.0+25114+90ecdb41golang-misc-1.26.10-4.module+el8.6.0+25114+90ecdb41.noarch.rpm
Red Hat Enterprise Linux8.6x86_64golang-race1.26.10-4.module+el8.6.0+25114+90ecdb41golang-race-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64.rpm
Red Hat Enterprise Linux8.6noarchgolang-src1.26.10-4.module+el8.6.0+25114+90ecdb41golang-src-1.26.10-4.module+el8.6.0+25114+90ecdb41.noarch.rpm
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22 Oct 2026 00:32Current
7High risk
Vulners AI Score7
CVSS 3.17.5
EPSS0.00813
SSVC
CWE-1341
Gonet packageLookupCNAMEcgo DNS resolverdouble-freeDenial of Service
3