VULNERABILITY INTELLIGENCE

CVE-2026-6722

CVSS score9.8 CRITICAL
EPSS probability0.89%
CISA KEVNot currently listed
Published2026-05-10
Last modified2026-07-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • security@php.net: CWE-416
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-825

Primary references