CVE-2025-40916: Gryphon Mojolicious::plugin::captchapng

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha. That version uses the built-in rand() function for generating the captcha text as well as image noise, which is insecure.

Affected products

• Gryphon Mojolicious::plugin::captchapng: version 1.05 only

Published 2025-06-16. Last modified 2026-06-17.