CVE-2026-3255

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Source

https://cve.org/CVERecord?id=CVE-2026-3255

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3255.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-3255

Published

2026-02-27T20:12:35.414Z

Modified

2026-07-15T01:49:12.680500506Z

Severity

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

Summary

HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function

Details

HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.

The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the 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.

HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.

Database specific

{
    "cwe_ids": [
        "CWE-338",
        "CWE-340"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3255.json",
    "cna_assigner": "CPANSec"
}

References

Affected packages

Git / github.com/tokuhirom/http-session2

Affected ranges

Type

GIT

Repo

https://github.com/tokuhirom/http-session2

Events

Introduced

Fixed

7baa6f0ef8a1e7ca602d7751fb3956e16e165f30

Fixed

9cfde4d7e0965172aef5dcfa3b03bb48df93e636

Database specific

{
    "cpe": "cpe:2.3:a:tokuhirom:http\\:\\:session2:*:*:*:*:*:perl:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.12"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*

0.01

0.02

0.03

0.04

0.05

1.*

1.00

1.01

1.02

1.03

1.04

1.05

1.06

1.07

1.08

1.09

1.10

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3255.json"