CVE-2026-6722: Use-After-Free in SOAP using Apache map
Fixed (Stale SOAPGLOBAL(refmap) pointer with Apache Map). (CVE-2026-6722)
Other sources
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.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.5.6 - Upgrade
Upgrade
debian/php7.4to a version that resolves this vulnerability.Fixed in 7.4.33-1+deb11u11 - Upgrade
Upgrade
debian/php8.2to a version that resolves this vulnerability.Fixed in 8.2.31-1~deb12u1Fixed in 8.2.32-1~deb12u1 - Upgrade
Upgrade
debian/php8.4to a version that resolves this vulnerability.Fixed in 8.4.23-1~deb13u1Fixed in 8.4.23-1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.2.31 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.3.31 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.4.21
Event History
Frequently Asked Questions
What is the severity of CVE-2026-6722?
CVE-2026-6722 has a high severity due to potential exploitation leading to remote code execution.
Which versions of PHP are affected by CVE-2026-6722?
CVE-2026-6722 affects 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.
How do I fix CVE-2026-6722?
To fix CVE-2026-6722, upgrade your PHP installation to version 8.5.6 or the latest available version.
What causes CVE-2026-6722?
CVE-2026-6722 is caused by a use-after-free vulnerability in the SOAP extension related to improper handling of pointers.
Is there a workaround for CVE-2026-6722?
There is no recommended workaround for CVE-2026-6722; upgrading to a fixed version is the best course of action.