The default 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.
Predicable session ids could allow an attacker to gain access to systems.
Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| KAZEBURO | Plack::Middleware::Session::Simple | unaffected |
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Project Subscriptions
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No advisories yet.
Solution
No solution given by the vendor.
Workaround
Users are advised to change the sid_generator attribute of Plack::Middleware::Session::Simple to a function that returns a securely generated session id based on a secure source of entropy from the system. Users may consider using Plack::Middleware::Session version 0.35 or later.
Thu, 05 Mar 2026 17:15:00 +0000
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cvssV3_1
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Thu, 05 Mar 2026 02:15:00 +0000
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| Description | Plack::Middleware::Session::Simple versions through 0.04 for Perl generates session ids insecurely. The default 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. Predicable session ids could allow an attacker to gain access to systems. Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923. | |
| Title | Plack::Middleware::Session::Simple versions through 0.04 for Perl generates session ids insecurely | |
| Weaknesses | CWE-338 CWE-340 |
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Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-03-05T01:24:34.151Z
Reserved: 2025-04-16T09:05:34.362Z
Link: CVE-2025-40926
Vulnrichment
Updated: 2026-03-05T16:29:20.447Z
NVD
Status : Received
Published: 2026-03-05T02:16:39.790
Modified: 2026-03-05T02:16:39.790
Link: CVE-2025-40926
Redhat
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OpenCVE Enrichment
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