CVE-2025-40916

CRITICALNVD 9.19.1—

9.1

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.

CVSS v3: 9.1
EG Score: 9.1(medium)
EPSS: 52.0%
KEV: Not listed

Published

June 16, 2025

Last Modified

April 15, 2026

Advisory Details (4)

Auto-updated May 21, 2026

No patch confirmed yet.

generic

CPAN Author’s Guide to Random Data for Security — CPAN Security Group (CPANSec) 🦆

https://security.metacpan.org/docs/guides/random-data-for-security.html

generic

Client Challenge

https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.06/changes

generic

Client Challenge

https://metacpan.org/release/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.04/diff/GRYPHON/Mojolicious-Plugin-CaptchaPNG-1.05/lib/Mojolicious/Plugin/CaptchaPNG.pm

generic

perlfunc - Perl builtin functions - metacpan.org

https://metacpan.org/pod/perlfunc#rand

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
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Frequently asked(5)

What is CVE-2025-40916?

CVE-2025-40916 is a critical vulnerability published on 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.

When was CVE-2025-40916 disclosed?

CVE-2025-40916 was first published in the National Vulnerability Database on June 16, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-40916 actively exploited?

CVE-2025-40916 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-40916?

CVE-2025-40916 has a CVSS v3 base score of 9.1 (NVD).

How do I remediate CVE-2025-40916?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40916, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-40916

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

CPAN Author’s Guide to Random Data for Security — CPAN Security Group (CPANSec) 🦆

Client Challenge

Client Challenge

perlfunc - Perl builtin functions - metacpan.org

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-40916?

Published

Last Modified

Advisory Details (4)

Frequently asked(5)