CVE-2026-13577
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable. The generate_id function in Dancer2::Core::Role::SessionFactory uses low-entropy sources such as rand(), making session ids easy to guess.
Risk Assessment
An attacker can guess session ids and hijack another user's session, gaining unauthorized access to the system.
Recommendation
Update Dancer2 to a version later than 2.1.0 or ensure the availability of Math::Random::ISAAC::XS and Crypt::URandom modules.
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Original NVD description (English source)
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable. Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available. The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function). These are all low-entropy and easily guessed sources. The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.