CVE-2026-5084
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
The WebDyne::Session library for Perl before version 3.003_704 generates session IDs insecurely. IDs are created using the rand() function and MD5 hash, making them predictable and unsuitable for cryptographic purposes.
Risk Assessment
Predictable session IDs could allow an attacker to hijack user sessions and gain unauthorized access to the system.
Recommendation
Update WebDyne::Session to version 3.003_704 or later.
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Original NVD description (English source)
WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely. The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest. The rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes. Predictable session ids could allow an attacker to gain access to systems. Note that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS