CVE-2026-6722 Use-After-Free in SOAP using Apache map
An attacker can achieve remote code execution by exploiting a use-after-free vulnerability in the PHP SOAP extension's object deduplication mechanism.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6722?
CVE-2026-6722 is a critical use after free vulnerability in Php Php, published on 10 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-6722?
3 open source packages ship an affected version, including libphp, php and php-min. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
libphp Bitnami | From 8.2.0 | 8.2.31, 8.3.31, 8.4.21, 8.5.6 |
php Bitnami | From 8.2.0 | 8.2.31, 8.3.31, 8.4.21, 8.5.6 |
php-min Bitnami | From 8.2.0 | 8.2.31, 8.3.31, 8.4.21, 8.5.6 |
Products include Php Php.
How do I fix CVE-2026-6722?
Upgrade libphp to a fixed version for your release line: 8.2.31, 8.3.31, 8.4.21 or 8.5.6.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-6722 being exploited?
There is no known exploitation of CVE-2026-6722 in the wild and no public exploit code.
Other vulnerabilities in Php Php
Sources
Also known as AZL-86349, BELL-CVE-2026-6722, BIT-libphp-2026-6722, BIT-php-2026-6722, BIT-php-min-2026-6722, DEBIAN-CVE-2026-6722 and 6 more.