CVE-2026-54905: concurrent-ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity
Overview
- Severity
- Medium (CVSS 5.5)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Jun
- Released
- 2026-06-27
- Last Updated
- 2026-06-30
- EPSS Score
- 0.11% (percentile: 1.3%)
Affected Products (1)
Open Source Software
- azl3 rubygem-concurrent-ruby 1.2.2-1 on Azure Linux 3.0
Revision History
- 2026-06-27: Information published.
- 2026-06-29: Information published.
- 2026-06-30: Information published.