Use-After-Free in SOAP using Apache map_CVE-2026-6722

9.5 / 10

CRITICAL

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/AU:Y/RE:M/U:Red

Description

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.

Basic Information

ID CVE-2026-6722

Source php

Published May 10, 2026 at 04:19

Affected Product

Vendor PHP Group

Product PHP

Version 8.2.*

Affected Versions PHP Group PHP 8.2.*
PHP Group PHP 8.3.*
PHP Group PHP 8.4.*
PHP Group PHP 8.5.*

CWE Classification

CWE-416

References

github.com /php/php-src/security/advisories/GHSA-85c2-q967-79q5

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    "published": "2026-05-10T04:19:15.288Z",
    "modified": "2026-05-10T04:19:15.288Z",
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