CVE-2026-39821: Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
Overview
- Severity
- Critical (CVSS 10)
- CVSS Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-May
- Released
- 2026-05-27
- Last Updated
- 2026-09-17
- EPSS Score
- 0.69% (percentile: 51.5%)
Affected Products (53)
Other
- 20981-17084
- 17591-17084
- 21177-17084
- 20984-17084
- 20985-17084
- 20986-17084
- 21319-17084
- 21276-17084
- 20991-17084
- 21271-17084
- 20993-17084
- 21272-17084
- 21132-17084
- 21278-17084
- 19322-17084
- 21203-17084
- 21206-17084
- 21315-17084
- 21281-17084
- 20582-17084
- 21284-17084
- 21252-17084
- 21007-17084
- 21008-17084
- 21256-17084
- 21299-17084
- 21011-17084
- 21273-17084
- 21274-17084
- 21013-17084
- 21014-17084
- 20966-17084
- 21015-17084
- 19324-17084
- 21016-17084
- 21280-17084
- 21020-17084
- 20968-17084
- 21428-17084
- 21419-17084
- 21397-17084
- 21418-17084
- 21435-17084
- 21430-17084
- 21411-17084
- 21423-17084
- 21378-17084
- 21414-17084
- 21432-17084
- 21778-17084
Open Source Software
- azl3 coredns 1.11.4-15 on Azure Linux 3.0
- azl3 etcd 3.5.28-1 on Azure Linux 3.0
- azl3 telegraf 1.31.0-19 on Azure Linux 3.0
Security Updates (1)
Revision History
- 2026-05-27: Information published.
- 2026-05-28: Information published.
- 2026-05-30: Information published.
- 2026-05-30: Information published.
- 2026-05-31: Information published.
- 2026-06-01: Information published.
- 2026-06-02: Information published.
- 2026-06-02: Information published.
- 2026-06-03: Information published.
- 2026-06-03: Information published.
- 2026-06-19: Information published.
- 2026-09-03: Information published.
- 2026-09-07: Information published.
- 2026-09-09: Information published.
- 2026-09-17: Information published.