CVE-2026-6722

CVE-2026-6722 · Use-After-Free in SOAP using Apache map

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 counts. When an apache:Map node contains duplicate keys, processing the second entry overwrites the first in the temporary result map, freeing the original PHP object while its stale pointer remains in the map. A subsequent href reference to the freed node can copy the dangling pointer into the result. As PHP string allocations can reclaim the freed memory region, an attacker with control over the SOAP request body can exploit this use-after-free to achieve remote code execution.

CVSS 9.5 · Critical · EPSS 0.9% · Fix available

Published

2026-05-10T04:19:15.288Z

Updated

2026-07-23T12:08:11.781Z

Stack: system · php

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