CVE-2026-3256
HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids
- State
- Published
- Severity
- 9.8 Critical
- Published
- Mar 28, 2026
- Updated
- Jun 29, 2026
- Reserved
- Feb 26, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
HTTP::SessionKTAT |
|
References
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm
- https://security.metacpan.org/docs/guides/random-data-for-security.htmltechnical-description
- https://metacpan.org/release/TOKUHIROM/http-session-0.54/changesrelease-notes
- http://www.openwall.com/lists/oss-security/2026/03/28/5
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