Is bcrypt affected by CVE-2026-33306?

RubyGems bcrypt is affected in <3.1.22.

Is CVE-2026-33306 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-33306

Q: Is CVE-2026-33306 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

RubyGems · bcrypt

Summary

bcrypt-ruby has an Integer Overflow that Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby

Severity: medium
EPSS: 0.2% (p13)
Also known as: GHSA-f27w-vcwj-c954
Published: 2026-03-19

References

https://github.com/bcrypt-ruby/bcrypt-ruby/security/advisories/GHSA-f27w-vcwj-c954
https://nvd.nist.gov/vuln/detail/CVE-2026-33306
https://github.com/bcrypt-ruby/bcrypt-ruby/commit/831ce64cb0a9502130fa93a28bfd9527a5fa45c4

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.