What’s Vulnerable › Vulnerabilities

CVE-2025-40925: Starch versions 0.14 and earlier generate session ids insecurely

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-20 · updated 2026-06-17
• Weakness: CWE-338

Description

Starch versions 0.14 and earlier generate session ids insecurely. The default session id generator returns a SHA-1 hash seeded with a counter, the epoch time, the built-in rand function, the PID, and internal Perl reference addresses. 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.

Affected products

• BLUEFEET Starch: from 0.01 through 0.14

References

• https://github.com/bluefeet/Starch/commit/5573449e64e0660f7ee209d1eab5881d4ccbee3b.patch
• https://github.com/bluefeet/Starch/pull/5
• https://metacpan.org/dist/Starch/source/lib/Starch/Manager.pm

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