Medium 6.5Published May 11, 2026

CVE-2026-5084WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely

Updated under an hour ago (Oct 27, 2026, 12:40 AM ET)

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It affects ASPEER WebDyne::Session. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ASPEER WebDyne::Session

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-340, CWE-338
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CPANSec
NVD analysis: Deferred
Record last updated: Aug 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ASPEER WebDyne::Session aspeer:webdyne_session (from the name)	before 3.003_704	CNA record

References

References

https://metacpan.org/release/ASPEER/WebDyne-2.075/source/lib/WebDyne/Session.pm#L120
https://github.com/aspeer/WebDyne/commit/7a3f949dc24e62a276eb0db629db64aca356e954.patch	patch
https://webdyne.org
https://security.metacpan.org/docs/guides/random-data-for-security.html	technical-description
http://www.openwall.com/lists/oss-security/2026/05/11/3

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.