CVE-2026-3256

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Source

https://cve.org/CVERecord?id=CVE-2026-3256

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3256.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-3256

Published

2026-03-28T18:52:39Z

Modified

2026-08-12T03:51:38Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids

Details

HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids.

HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.

The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.

Database specific

{
    "cna_assigner": "CPANSec",
    "cwe_ids": [
        "CWE-338",
        "CWE-340"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3256.json"
}

References

Affected packages

Git / github.com/tokuhirom/http-session

Affected ranges

Type

GIT

Repo

https://github.com/tokuhirom/http-session

Events

Introduced

Fixed

20948a2499bc1b06617a7669a9d155f8e9bfbcd7

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.54"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

0.*

0.31

0.32

0.33

0.34

0.35

0.36

0.37

0.38

0.39

0.40

0.41

0.42

0.43

0.44

0.45

0.46

0.48

0.49

0.50

0.51

0.52

0.53

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3256.json"