--- id: CVE-2026-39821 title: >- The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label summary: >- 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 … severity: critical cvss: 9.6 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N' cwe: - CWE-1289 vendor: golang product: net affected: - net < 0.55.0 patched: - net 0.55.0 published: '2026-05-22' updated: '2026-09-17' sourceUpdated: '2026-09-17T12:18:05.767' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39821' references: - url: 'https://go.dev/cl/767220' label: security@golang.org - url: 'https://go.dev/issue/78760' label: security@golang.org - url: 'https://groups.google.com/g/golang-announce/c/94pEornpRlI' label: security@golang.org - url: 'https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8' label: security@golang.org - url: 'https://pkg.go.dev/vuln/GO-2026-5026' label: security@golang.org - url: 'https://access.redhat.com/errata/RHSA-2026:23262' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:23264' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26546' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - 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url: 'https://access.redhat.com/errata/RHSA-2026:66432' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67149' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67159' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67160' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67287' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67319' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:67517' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68504' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-39821' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2480756' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c tags: - nvd - cve.org - osv - go ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-05-23T03:55:58.522682Z' epss: 0.00641 epssPercentile: 0.48538 aliases: - GO-2026-5026 ecosystem: go ingestedAt: '2026-07-02T02:20:05.688Z' --- ## Overview 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 - `net < 0.55.0` ## Remediation Upgrade past the affected range: - `net 0.55.0` ## Package advisory (CVE-2026-39821) Affected packages: - `stdlib >= 1.27.0-0, < 1.27.0-rc.3` - `golang.org/x/net < 0.55.0` Patched in: - `stdlib 1.27.0-rc.3` - `golang.org/x/net 0.55.0` Source: https://osv.dev/vulnerability/GO-2026-5026