CVE-2026-39821
golang.org/x/net golang.org/x/net/idna, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 취약점
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".
- 대응 우선순위
- 점검
- CVSS
- 9.6
- EPSS
- 0.66% 백분위 47.8% · 2026.08.02 기준
- CISA KEV
- 미등록
- 조치 기한
- -
- 공개일
- 2026.05.23