CVE-2023-0568: Array overrun in common path resolve code

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-16 · updated 2026-06-17
Weakness: CWE-131

Description

In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16 and 8.2.X before 8.2.3, core path resolution function allocate buffer one byte too small. When resolving paths with lengths close to system MAXPATHLEN setting, this may lead to the byte after the allocated buffer being overwritten with NUL value, which might lead to unauthorized data access or modification.

Affected products

PHP: from 8.0.0 before 8.0.28; from 8.1.0 before 8.1.16; from 8.2.0 before 8.2.3 — fixed in 8.0.28, 8.1.16, 8.2.3

How to fix

Upgrade to a fixed version: PHP 8.0.28, 8.1.16, 8.2.3. Check the vendor advisory for mitigations.

References

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