Is rack-session affected by CVE-2026-39324?

RubyGems rack-session is affected in >=2.0.0 <2.1.2.

Is CVE-2026-39324 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

critical

CVE-2026-39324

Q: Is CVE-2026-39324 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

RubyGems · rack-session

Summary

Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization

Severity: critical
EPSS: 0.3% (p18)
Also known as: GHSA-33qg-7wpp-89cq
Published: 2026-04-08

References

https://github.com/rack/rack-session/security/advisories/GHSA-33qg-7wpp-89cq
https://nvd.nist.gov/vuln/detail/CVE-2026-39324
https://github.com/rack/rack-session

Related advisories

CVE-2025-46336 — medium · RubyGems/rack-session

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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.