Vulnerability Description
WebDyne::Session versions through 2.075 for Perl generates 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://metacpan.org/release/ASPEER/WebDyne-2.075/source/lib/WebDyne/Session.pm#
- https://security.metacpan.org/docs/guides/random-data-for-security.html
- https://webdyne.org
- http://www.openwall.com/lists/oss-security/2026/05/11/3
FAQ
What is CVE-2026-5084?
CVE-2026-5084 is a vulnerability with a CVSS score of 6.5 (MEDIUM). WebDyne::Session versions through 2.075 for Perl generates 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....
How severe is CVE-2026-5084?
CVE-2026-5084 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5084?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.