CVE-2026-13577 - Dancer2 versions through 2.1.0 for Perl generate insecure session ids when CSPRNG modules are unavailable

CVE-2026-13577 - Dancer2 versions through 2.1.0 for Perl generate insecure session ids when CSPRNG modules are unavailable

https://cvefeed.io/rssfeed/latest.atom / Mon, 07/20/2026 - 13:06
CVE ID :CVE-2026-13577
Published : July 20, 2026, 8:16 a.m. | 2 hours, 33 minutes ago
Description :Dancer2 versions through 2.1.0 for Perl generate insecure session ids when CSPRNG modules are unavailable. Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id when both Math::Random::ISAAC::XS and Crypt::URandom are unavailable. 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.
Severity: 0.0 | NA
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