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golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing

🗓️ 15 Jul 2026 12:33:19Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 10 Views

Privilege escalation flaw in golang.org/x/net/idna where ToASCII/ToUnicode accept Punycode labels mapping to ASCII hostnames, bypassing checks.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.8aarch64rhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xrhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64rhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64rhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xrhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64rhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64rhc-debugsource1:0.2.7-8.el9_8rhc-debugsource-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc-debugsource1:0.2.7-8.el9_8rhc-debugsource-1:0.2.7-8.el9_8.ppc64le.rpm
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27 Aug 2026 15:26Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.19.6
EPSS0.00692
SSVC
10