CVE-2026-3256
critical · 9.8HTTP::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.
9.8
CVSS
0.5%
EPSS (exploit prob.)
44th
EPSS percentile
2026-03-28
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-338CWE-340
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| ktat | http::session | <= 0.53 |
Check a specific version with /api/v1/cve/match.
References
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pm
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pm
- https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes
- https://security.metacpan.org/docs/guides/random-data-for-security.html
- http://www.openwall.com/lists/oss-security/2026/03/28/5
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-3256