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-.
CVSS 9.6EPSS 0.655%Risque 1.02
Voir la source- Publication
- 2026-05-22 16:16:20
- Versions concernées
- unknown
- Type
- Bibliothèque
- Dernière modification
- 2026-08-11 13:18:37
- Vecteur
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N