CVE Explorer

CVE-2026-54904

concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compare_and_set(old_value, new_value) succeeds; Numeric compare_and_set, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f7881fc4593cb2ed2ef64f770f75775c5e13492ade1cc4ea0b6dbf82a0a81f24

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"concurrent-ruby","vendor":"ruby-concurrency","versions":[{"status":"affected","version":"< 1.3.7"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:2e7265580c69e7ed3f2db839f43252d0b2a3bbf41c7826d8ef99e9c1175295a6 · sha256:733ca166b3e9fd6e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:2e7265580c69e7ed3f2db839f43252d0b2a3bbf41c7826d8ef99e9c1175295a6 · sha256:733ca166b3e9fd6e… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-835","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:2e7265580c69e7ed3f2db839f43252d0b2a3bbf41c7826d8ef99e9c1175295a6 · sha256:733ca166b3e9fd6e… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-h8w8-99g7-qmvj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-h8w8-99g7-qmvj"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2e7265580c69e7ed3f2db839f43252d0b2a3bbf41c7826d8ef99e9c1175295a6 · sha256:733ca166b3e9fd6e… · /containers/cna/references/0

{"tags":["exploit"],"url":"https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-h8w8-99g7-qmvj"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2e7265580c69e7ed3f2db839f43252d0b2a3bbf41c7826d8ef99e9c1175295a6 · sha256:733ca166b3e9fd6e… · /containers/adp/0/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.

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