CVE-2026-6722

Use After Free in SOAP deduplication leads to remote code execution

Publication Date 2026-05-10
Severity Critical
Type Remote Code Execution
Affected PHP Versions
  • 7.1.0-7.1.33
  • 7.2.0-7.2.34
  • 7.3.0-7.3.33
  • 7.4.0-7.4.33
  • 8.0.0-8.0.30
  • 8.1.0-8.1.34
  • 8.2.0-8.2.30
  • 8.3.0-8.3.30
  • 8.4.0-8.4.20
  • 8.5.0-8.5.5
Fixed Product Versions
  • ZendPHP 7.1
  • ZendPHP 7.2
  • ZendPHP 7.3
  • ZendPHP 7.4
  • ZendPHP 8.1
  • ZendPHP 8.2
  • ZendPHP 8.3
  • ZendPHP 8.4
  • ZendPHP 8.5
  • ZendServer 2021.4.5

CVE Details

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.

Recommendations

If you are using the SOAP extension, we recommend immediately updating to a patched PHP version.