Summaryinfo

A vulnerability categorized as problematic has been discovered in JJNAPIORK PAGI::Middleware::Session::Store::Cookie up to 0.001003. The impacted element is the function rand of the file /dev/urandom. Executing a manipulation can lead to weak prng. This vulnerability is registered as CVE-2026-5087. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in JJNAPIORK PAGI::Middleware::Session::Store::Cookie up to 0.001003 and classified as problematic. This vulnerability affects the function rand of the file /dev/urandom. The manipulation with an unknown input leads to a weak prng vulnerability. The CWE definition for the vulnerability is CWE-338. The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at metacpan.org. This vulnerability was named CVE-2026-5087 since 03/28/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17531). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Middleware

Vendor

• JJNAPIORK

Name

• PAGI::Middleware::Session::Store::Cookie

Version

• 0.001003

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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