CVE Explorer
CVE-2026-54905
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as al
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"concurrent-ruby","vendor":"ruby-concurrency","versions":[{"status":"affected","version":"< 1.3.7"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:605285fc6126e12ae7c15181ebb0c9aa67df25d5ed6e317ccda798c0cb9adf63 · sha256:cfc870c126266c8e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":2,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:605285fc6126e12ae7c15181ebb0c9aa67df25d5ed6e317ccda798c0cb9adf63 · sha256:cfc870c126266c8e… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-128","description":"CWE-128: Wrap-around Error","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:605285fc6126e12ae7c15181ebb0c9aa67df25d5ed6e317ccda798c0cb9adf63 · sha256:cfc870c126266c8e… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"tags":["exploit"],"url":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-wv3x-4vxv-whpp"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:605285fc6126e12ae7c15181ebb0c9aa67df25d5ed6e317ccda798c0cb9adf63 · sha256:cfc870c126266c8e… · /containers/adp/0/references/0
{"name":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-wv3x-4vxv-whpp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-wv3x-4vxv-whpp"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:605285fc6126e12ae7c15181ebb0c9aa67df25d5ed6e317ccda798c0cb9adf63 · sha256:cfc870c126266c8e… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.