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CVE-2026-13577 affects Dancer2 for Perl versions before 2.2.0. Dancer2::Core::Role::SessionFactory::generate_id silently uses an insecure fallback when both Math::Random::ISAAC::XS and Crypt::URandom are unavailable. The fallback derives session identifiers from Perl's built-in rand(), a SHA-1 hash, and predictable or low-entropy process and runtime values. Perl's rand() is seeded with 32 bits and is not suitable for security-sensitive identifier generation. Consequently, Dancer2 can issue predictable session identifiers rather than identifiers generated with a CSPRNG.
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No public exploit code observed for this vulnerability.
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12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible, low-complexity vulnerability in Fedora 43's perl-dancer2 package that requires no privileges or user interaction and may cause low confidentiality impact and high availability impact.
A network-reachable vulnerability affecting the perl-dancer2 package on Fedora 44. The provided CVSS v3 vector indicates low-complexity, unauthenticated exploitation without user interaction, with low confidentiality impact and high availability impact.
A remotely exploitable, low-complexity vulnerability affecting perl-dancer2 on Fedora 45. It requires no privileges or user interaction and can cause high availability impact with low confidentiality impact.
A vulnerability in perl-Dancer2/Dancer2 involving predictable session identifiers that could allow unauthorized system access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.