Vulnerability · Published Jun 16, 2025 · Assigned by CPANSec
CVE-2025-40916Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha text
Critical 9.1
In plain English
A critical-severity security flaw in Mojolicious::Plugin::CaptchaPNG from GRYPHON. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.4%top 63.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GRYPHON | Mojolicious::Plugin::CaptchaPNG | 1.05 |
Weakness: CWE-338, CWE-804 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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