Weak Random Number Generation in Mojolicious Plugin for Perl
CVE-2025-40916

9.1CRITICAL

Key Information:

Vendor

Gryphon

Status
Mojolicious::plugin::captchapng
Vendor
CVE Published:
16 June 2025

What is CVE-2025-40916?

The Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl suffers from a vulnerability due to its reliance on the built-in rand() function for generating both captcha text and image noise. This method of random number generation is weak and can lead to predictability, making it easier for attackers to bypass captchas and exploit the system's integrity. It's crucial for developers to upgrade to a more secure version or utilize a stronger random number generation approach to mitigate this security risk.

Affected Version(s)

Mojolicious::Plugin::CaptchaPNG 1.05

References

https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-C...
https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-C...
https://metacpan.org/pod/perlfunc#rand

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-40916 : Weak Random Number Generation in Mojolicious Plugin for Perl