CVE-2026-39821
CRITICAL9.6EPSS 0.05%Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
發布日:2026/5/22修改日:2026/6/3
也稱為:DEBIAN-CVE-2026-39821
描述
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".
受影響套件(2)
- Debian/golang-golang-x-netfrom 0
- Go/golang.org/x/netfrom 0, < 0.55.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |