CVE-2023-0662: DoS vulnerability when parsing multipart request body

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-16 · updated 2026-06-17
Weakness: CWE-400

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, excessive number of parts in HTTP form upload can cause high resource consumption and excessive number of log entries. This can cause denial of service on the affected server by exhausting CPU resources or disk space.

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

https://github.com/php/php-src/security/advisories/GHSA-54hq-v5wp-fqgv
https://security.netapp.com/advisory/ntap-20230517-0001/
https://github.com/php/php-src/security/advisories/GHSA-54hq-v5wp-fqgv
https://security.netapp.com/advisory/ntap-20230517-0001/

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