CVE-2026-5087
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
The PAGI::Middleware::Session::Store::Cookie module for Perl generates random bytes insecurely. If reading from /dev/urandom fails, it falls back to the rand function, which is not cryptographically secure. This can lead to a predictable initialization vector (IV) for encrypting session cookies.
Risk Assessment
A predictable IV makes it easier for an attacker to decrypt and tamper with session data stored in cookies, potentially leading to session hijacking.
Recommendation
Update the module to a version that uses a secure random number generator, or use an alternative solution.
Related vulnerabilities
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- CVE-2026-90608Critical
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- CVE-2026-90606Critical
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- CVE-2026-78006Critical
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Original NVD description (English source)
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.