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CVE-2026-3256

CRITICAL

9.8

Description

HTTP::Session versions through 0.53 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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/28/2026

Last Modified4/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

ktat:http\

Weaknesses (CWE)

CWE-338CWE-340

References

https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm(9b29abf9-4ab0-4765-b253-1875cd9b441e)

https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm(9b29abf9-4ab0-4765-b253-1875cd9b441e)

https://security.metacpan.org/docs/guides/random-data-for-security.html(9b29abf9-4ab0-4765-b253-1875cd9b441e)

http://www.openwall.com/lists/oss-security/2026/03/28/5(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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