MEDIUM 5.5 Microsoft
CVE-2026-54905
concurrent-ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity
Microsoft Security Update 2026-Jun: concurrent-ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity
Affected Products
- azl3 rubygem-concurrent-ruby 1.2.2-1 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54905
- https://nvd.nist.gov/vuln/detail/CVE-2026-54905
This medium severity vulnerability with a CVSS score of 5.5 was published on 2026-06-09 via Microsoft. Affected: azl3 rubygem-concurrent-ruby 1.2.2-1 on Azure Linux 3.0.
vulnfeed aggregates 9214 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.