{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39821","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","state":"PUBLISHED","assignerShortName":"Go","dateReserved":"2026-04-07T18:13:03.526Z","datePublished":"2026-05-22T15:01:21.462Z","dateUpdated":"2026-07-10T12:05:36.478Z"},"containers":{"cna":{"providerMetadata":{"orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","shortName":"Go","dateUpdated":"2026-05-22T15:01:21.462Z"},"title":"Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna","descriptions":[{"lang":"en","value":"The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\"."}],"affected":[{"vendor":"golang.org/x/net","product":"golang.org/x/net/idna","collectionURL":"https://pkg.go.dev","packageName":"golang.org/x/net/idna","versions":[{"version":"0","lessThan":"0.55.0","status":"affected","versionType":"semver"}],"programRoutines":[{"name":"Profile.process"},{"name":"Profile.ToASCII"},{"name":"Profile.ToUnicode"},{"name":"ToASCII"},{"name":"ToUnicode"}],"defaultStatus":"unaffected"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-1289: Improper Validation of Unsafe Equivalence in Input"}]}],"references":[{"url":"https://go.dev/cl/767220"},{"url":"https://go.dev/issue/78760"},{"url":"https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"},{"url":"https://pkg.go.dev/vuln/GO-2026-5026"}],"credits":[{"lang":"en","value":"KC1zs4 (https://github.com/KC1zs4)"}]},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-1289","lang":"en","description":"CWE-1289 Improper Validation of Unsafe Equivalence in Input"}]}],"metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":9.6,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-23T03:55:58.522682Z","id":"CVE-2026-39821","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-27T13:13:15.606Z"}},{"affected":[{"cpes":["cpe:/a:redhat:openshift:4.22::el8","cpe:/a:redhat:openshift:4.22::el9"],"defaultStatus":"affected","product":"Red Hat OpenShift Container Platform 4.22","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:edge_manager:1.0::el9"],"defaultStatus":"affected","product":"RHEM 1.0 for RHEL 9","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 10)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux:8::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 8)","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux:9::appstream"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AppStream (v. 9)","vendor":"Red 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