CVE-2026-3256
criticalpriority · track · 39EPSS 0.005 · 45 %ileEUUSEPSS · scored 2026-10-26
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/03/28/5cnnvd
- https://access.redhat.com/security/cve/cve-2026-3256cnnvd
- https://metacpan.org/dist/HTTP-Session2Patchcnnvd
- https://metacpan.org/release/KTAT/cnnvd
- https://security.metacpan.org/docs/guides/random-data-for-security.htmlcnnvd
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pmenisa_euvd
- https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pmenisa_euvd
- https://metacpan.org/release/TOKUHIROM/http-session-0.54/changesenisa_euvd
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