EUVD-2026-17531
GHSA-r6mr-wmgj-f864
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3Description
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely. PAGI::Middleware::Session::Store::Cookie attempts to read bytes from the /dev/urandom device directly. If that fails (for example, on systems without the device, such as Windows), then it will emit a warning that recommends the user install Crypt::URandom, and then return a string of random bytes generated by the built-in rand function, which is unsuitable for cryptographic applications. This modules does not use the Crypt::URandom module, and installing it will not fix the problem. The random bytes are used for generating an initialisation vector (IV) to encrypt the cookie. A predictable IV may make it easier for malicious users to decrypt and tamper with the session data that is stored in the cookie.
Analysis
PAGI::Middleware::Session::Store::Cookie through version 0.001003 generates cryptographically weak initialization vectors (IVs) for session cookie encryption by falling back to Perl's built-in rand() function when /dev/urandom is unavailable, particularly affecting Windows systems. This predictable IV generation enables attackers to decrypt and tamper with session data stored in cookies, compromising session confidentiality and integrity. …
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