What’s Vulnerable › Vulnerabilities

CVE-2022-31627: Heap buffer overflow in finfo_buffer

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-07-28 · updated 2026-06-17
• Weakness: CWE-590

Description

In PHP versions 8.1.x below 8.1.8, when fileinfo functions, such as finfo_buffer, due to incorrect patch applied to the third party code from libmagic, incorrect function may be used to free allocated memory, which may lead to heap corruption.

Affected products

• PHP: from 8.1.0 before 8.1.8 — fixed in 8.1.8

How to fix

Upgrade to a fixed version: PHP 8.1.8. Check the vendor advisory for mitigations.

References

• https://bugs.php.net/bug.php?id=81723
• https://security.gentoo.org/glsa/202209-20
• https://security.netapp.com/advisory/ntap-20220826-0008/
• https://bugs.php.net/bug.php?id=81723
• https://security.gentoo.org/glsa/202209-20
• https://security.netapp.com/advisory/ntap-20220826-0008/

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