Vulnerability · Published Mar 31, 2026 · Assigned by CPANSec
CVE-2026-5087PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely
High 7.5
In plain English
A high-severity security flaw in PAGI::Middleware::Session::Store::Cookie from JJNAPIORK. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| JJNAPIORK | PAGI::Middleware::Session::Store::Cookie | 0 – through 0.001003 |
Weakness: CWE-338, CWE-1204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://metacpan.org/release/JJNAPIORK/PAGI-Middleware-Session-Store-Cookie-0.001003/source/lib/PAGI/Middleware/Session/Store/Cookie.pm#L156-173
- https://metacpan.org/release/JJNAPIORK/PAGI-Middleware-Session-Store-Cookie-0.001004/changes release-notes
- http://www.openwall.com/lists/oss-security/2026/03/31/10