CRITICALRubyGems →
Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization
Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization
Affected packages
- rack-session— 2.0.0 → 2.1.2
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- 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
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack-session/CVE-2026-39324.yml
Structured record: https://osv.dev/vulnerability/GHSA-33qg-7wpp-89cq
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