Is jwt affected by CVE-2026-45363?

RubyGems jwt is affected in >=3.0.0 <3.2.0, <2.10.3.

Is CVE-2026-45363 being exploited?

Not on the CISA KEV list. EPSS exploit probability is not available.

high

CVE-2026-45363

Q: Is CVE-2026-45363 being exploited?

Not on the CISA KEV list. EPSS exploit probability is not available.

RubyGems · jwt

Summary

ruby-jwt: Empty-key HMAC bypass; cross-language sibling of CVE-2026-44351

Severity: high
Also known as: GHSA-c32j-vqhx-rx3x
Published: 2026-05-18

References

https://github.com/jwt/ruby-jwt/security/advisories/GHSA-c32j-vqhx-rx3x
https://github.com/jwt/ruby-jwt/issues/724
https://github.com/jwt/ruby-jwt/commit/db560b769a07bd9724e77ff505011ac01872106f

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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.