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

Routine

HIGH 8.4UPGRADE

CVE-2026-37552 is a high-severity flaw (CVSS 8.4) affecting mix php. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 a

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-05-01
Last modified	2026-07-08

Publisher (CNA): MITRE · Vendor: openmix

Last updated 2026-07-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 16:16 UTCPublished CVE record published
2026-07-08 03:26 UTCUpdated Record last modified

openmix mix php UPGRADE

Affected: >= 2.0.1 and <= 2.2.17

Fixed in: newer than 2.2.17

Safe to downgrade to: a release before 2.0.1

1. Check installed version

apt-cache policy mix-php || rpm -q mix-php || mix-php --version

2. UPGRADE to newer than 2.2.17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mix-php

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mix-php

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison mix-php sudo apt install mix-php=<VERSION_BEFORE_2.0.1> sudo apt-mark hold mix-php

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mix-php sudo dnf downgrade mix-php-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add mix-php

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-37552?

mix php: upgrade to newer than 2.2.17. Exact commands for each OS are on this page.

Is CVE-2026-37552 being exploited?

CVE-2026-37552 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-37552 affect?

CVE-2026-37552 affects mix php. Severity is high (CVSS 8.4). 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_f

How urgent is CVE-2026-37552?

Priority 34/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-42475 MEDIUM 6.5 UPGRADE SQL injection vulnerability in MixPHP Framework 2.x thru 2.2.17 via crafted `on` array to the joinOn function

References

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