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CVE-2025-40916

Good to know:

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Date: June 16, 2025

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.

Severity Score

Related Resources (6)

https://metacpan.org/pod/perlfunc#rand
https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.06/changes
https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.04/diff/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.05/lib/Mojolicious/Plugin/CaptchaPNG.pm
https://security.metacpan.org/docs/guides/random-data-for-security.html
https://nvd.nist.gov/vuln/detail/CVE-2025-40916
https://www.mend.io/vulnerability-database/CVE-2025-40916

Severity Score

Weakness Type (CWE)

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

CWE-338

Guessable CAPTCHA

CWE-804

Top Fix

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Upgrade Version

Upgrade to version https://github.com/gryphonshafer/Mojo-Plugin-CaptchaPNG.git - v1.06

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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