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CVE-2026-13577 is a vulnerability in Dancer2 for Perl affecting versions through 2.1.0 in which session identifiers can be generated from predictable, low-entropy inputs when cryptographically secure random number generator modules are unavailable. The issue is in Dancer2::Core::Role::SessionFactory::generate_id, which silently falls back to a rand()-derived session ID generation path if both Math::Random::ISAAC::XS and Crypt::URandom are not present. In the fallback path, the session ID is derived from a SHA-1 hash over values including Perl’s built-in rand() output, the module path, an internal counter, the process ID, the module instance memory address, and a shuffled character string generated with List::Util::shuffle, which also relies on rand(). Because Perl’s built-in rand() is not suitable for security-sensitive use and is seeded with limited entropy, the resulting session identifiers may be guessable or predictable.
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Cross-references every affected SKU, including bundled OEM variants.
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