CVE-2026-54906

criticalCVSS 9.8covered by 1 sourcefirst seen 2026-06-09

CSIRTS triage

What: The vulnerability allows incorrect thread write releases and read-release counter corruption.
Who is affected: Users of the concurrent-ruby library.
Urgency: Remediation is critical due to the high severity and potential for exploitation.
Action: Upgrade to the patched version of concurrent-ruby.

AI-assisted analysis generated from the source advisory — verify against the original.

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Low exploitation risk0.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

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