CVE-2026-6722 Affecting php-soap package, versions <0:5.4.16-46.amzn2.0.7


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.35% (58th percentile)

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  • Snyk IDSNYK-AMZN2-PHPSOAP-16881532
  • published27 May 2026
  • disclosed10 May 2026

Introduced: 10 May 2026

NewCVE-2026-6722  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 php-soap to version 0:5.4.16-46.amzn2.0.7 or higher.
This issue was patched in ALAS2-2026-3316.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-soap package and not the php-soap package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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 Base Scores

version 3.1