Deserialization in Openmix Mix PHP
CVE-2026-37552
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/mix-php/mix (Product)
- github.com/mix-php/mix/blob/v2.2.17/src/sync-invoke/src/Server.php (Product)
- gist.github.com/sgInnora/fa46386840fe978a30d7e53c458f2975 (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-37552?
- CVE-2026-37552 is a high-severity vulnerability in Openmix Mix PHP, classified under Deserialization of Untrusted Data. CVSS score: 8.4/10. Published 2026-05-01.
- How severe is CVE-2026-37552?
- High severity. CVSS v3 base score is 8.4 out of 10.