What is CVE-2026-6722?

CVE-2026-6722 is a critical-severity vulnerability in Php, classified under Use After Free. CVSS score: 9.8/10. Published 2026-05-10.

How severe is CVE-2026-6722?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Php

CVE-2026-6722

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 SOAP extension's object deduplication mechanism stores pointers to PHP objects in a global map without incrementing their reference…

Vulnerability class: Use-After-Free

EPSS: 0.004 (59.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Php
Php Group — versions 8.2.*, 8.3.*, 8.4.*

Weakness classification (CWE)

CWE-416 — Use After Free

References

security@php.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-6722?: CVE-2026-6722 is a critical-severity vulnerability in Php, classified under Use After Free. CVSS score: 9.8/10. Published 2026-05-10.
How severe is CVE-2026-6722?: Critical severity. CVSS v3 base score is 9.8 out of 10.