CVEvulnerability
CVE-2026-3256
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2026-03-28
- Last modified
- 2026-06-29
- Assigner
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-338, CWE-340
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.
Affected configurations
• ktat http\ \ (<= 0.53)
Related
References
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm Product
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm Product
- https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes metacpan.org
- https://security.metacpan.org/docs/guides/random-data-for-security.html Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/28/5 Mailing List, Third Party Advisory