PT-2026-39444 · Php · Php

Brettgervasoni + 2 · Published 2026-05-10 · Updated 2026-05-10 · CVE-2026-6722

NVD

CVSS v4.0

9.5

Critical

Base vector

AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:M/U:Red

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.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-6722

Affected Products

Php

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-6722 · Security Note
• https://github.com/php/php-src/security/advisories/GHSA-85c2-q967-79q5 · Vendor Advisory