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CVE-2026-39821

9.6 Critique

Publiée le 22/05/2026 à 18:16 · Modifiée le 17/09/2026 à 14:18 · Modifiée · Source : security@golang.org

Description

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".

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Produits concernés

Scores CVSS

VersionScoreSourceVecteur
3.1 9.6 Critique 134c704f-9b21-4f2e-91b3-4a467353bcc0 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1 8.2 Élevée 0b0ca135-0b70-47e7-9f44-1890c2a1c46c CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Faiblesses (CWE)

Références

Ailleurs