Windows
CVE-2026-3255
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.
The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the 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.
HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.
AnalysisAI
HTTP::Session2 before version 1.12 for Perl generates predictable session identifiers on Windows systems when /dev/urandom is unavailable, falling back to weak randomization using rand() combined with guessable values like PID and epoch time. An attacker could predict valid session IDs to hijack user sessions, as SHA-1 hashing of these weak inputs provides insufficient cryptographic protection. This affects Perl applications using HTTP::Session2 on Windows platforms where secure random sources are not accessible.
Technical ContextAI
Affects the rand component of Http\. HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.
The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the 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.
HTTP::Session2 after version 1.02 will attempt to use the /d
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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