CVE-2026-65954 PHPCSUtils: Remote code execution via eval() in AbstractArrayDeclarationSniff::getActualArrayKey()
Attackers can execute arbitrary code on the scanning host by providing malicious array keys in PHP code analyzed by PHPCSUtils.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-65954?
CVE-2026-65954 is a high-severity code injection vulnerability in PHPCSStandards PHPCSUtils, published on 12 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
PHPCSUtils is a suite of utility functions for use with PHP_CodeSniffer. From 1.0.0-alpha1 until 1.2.3, PHPCSUtils\AbstractSniffs\AbstractArrayDeclarationSniff::getActualArrayKey() evaluates attacker-controlled array-key expressions with eval(), allowing callback-form keys in untrusted PHP code scanned by an extending sniff to execute arbitrary commands on the scanning host. Known reachable paths include Universal.Arrays.DuplicateArrayKey and Universal.Arrays.MixedArrayKeyTypes. This issue is fixed in version 1.2.3.
Weakness: CWE-95
Which versions are affected by CVE-2026-65954?
2 open source packages ship an affected version, including phpcsstandards/phpcsutils.
| Package | Affected | Fixed in |
|---|---|---|
phpcsstandards/phpcsutils Packagist | From 1.0.0-alpha1 | 1.2.3 |
phpcsstandards/phpcsutils Packagist | From 1.0.0-alpha1 | 1.2.3 |
How do I fix CVE-2026-65954?
Upgrade phpcsstandards/phpcsutils to 1.2.3 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-65954 being exploited?
There is no known exploitation of CVE-2026-65954 in the wild and no public exploit code.
Sources
Also known as GHSA-r6hr-vr92-vv28.