CVE-2026-7568

What it is

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the metaphone() function in ext/standard/metaphone.c uses a signed int variable to track the current position within the input string. If a string longer than 2,147,483,647 bytes is passed, a signed integer overflow occurs, resulting in undefined behavior. This can lead to an out-of-bounds read, causing a segmentation fault or access to unrelated memory, and may affect the availability of the PHP process.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-10 05:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-24 08:10 UTC Last updatedMost recent change to the record

Details

Published

2026-05-10 05:16 UTC

Last modified

2026-07-24 08:10 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-125 · Out-of-bounds read

Record status

Modified

Affected

• PHP < 8.2.31
• PHP < 8.3.31
• PHP < 8.4.21
• PHP < 8.5.6

Attack profile CVSS 4.0 · 6.3

Attack vector

Network

Complexity

High

Attack requirements

Present

Privileges needed

None

User interaction

None

Confidentiality

Low

Integrity

Low

Availability

Low