CVE-2026-39324

Summary

Rack::Session is a session management implementation for Rack. From 2.0.0 to before 2.1.2, Rack::Session::Cookie incorrectly handles decryption failures when configured with secrets:. If cookie decryption fails, the implementation falls back to a default decoder instead of rejecting the cookie. This allows an unauthenticated attacker to supply a crafted session cookie that is accepted as valid session data without knowledge of any configured secret. Because this mechanism is used to load session state, an attacker can manipulate session contents and potentially gain unauthorized access. This vulnerability is fixed in 2.1.2.

Affected Software

VendorProductVersion RangeStatus
rackrack-session>= 2.0.0, < 2.1.2affected

Weaknesses

  • CWE-287: CWE-287: Improper Authentication
  • CWE-345: CWE-345: Insufficient Verification of Data Authenticity
  • CWE-502: CWE-502: Deserialization of Untrusted Data
  • CWE-565: CWE-565: Reliance on Cookies without Validation and Integrity Checking

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References