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CVE-2025-40916                                       CPAN Security Group
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         CVE ID:  CVE-2025-40916
   Distribution:  Mojolicious-Plugin-CaptchaPNG
       Versions:  1.05

       MetaCPAN: https://metacpan.org/dist/Mojolicious-Plugin-CaptchaPNG
       VCS Repo: https://github.com/gryphonshafer/Mojo-Plugin-CaptchaPNG

Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak
random number source for generating the captcha text

Description
-----------
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.

Problem types
-------------
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator
- CWE-804 Guessable CAPTCHA

Solutions
---------
Users should upgrade to version 1.06 or later.

References
----------
https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.04/diff/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.05/lib/Mojolicious/Plugin/CaptchaPNG.pm
https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.06/changes
https://metacpan.org/pod/perlfunc#rand
https://security.metacpan.org/docs/guides/random-data-for-security.html