CVE-2022-31630: OOB read due to insufficient input validation in imageloadfont()

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-11-14 · updated 2026-06-17
Weakness: CWE-131

Description

In PHP versions prior to 7.4.33, 8.0.25 and 8.1.12, when using imageloadfont() function in gd extension, it is possible to supply a specially crafted font file, such as if the loaded font is used with imagechar() function, the read outside allocated buffer will be used. This can lead to crashes or disclosure of confidential information.

Affected products

PHP: from 7.4.0 before 7.4.33; from 8.0.0 before 8.0.25; from 8.1.0 before 8.1.12 — fixed in 7.4.33, 8.0.25, 8.1.12

How to fix

Upgrade to a fixed version: PHP 7.4.33, 8.0.25, 8.1.12. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-31630 or the next vulnerability affects your stack