CVE-2026-6722

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6722.json

https://github.com/php/php-src/security/advisories/GHSA-85c2-q967-79q5

https://bugzilla.redhat.com/show_bug.cgi?id=2468560

https://access.redhat.com/security/cve/CVE-2026-6722

https://access.redhat.com/errata/RHSA-2026:34354

https://access.redhat.com/errata/RHSA-2026:33449

https://access.redhat.com/errata/RHSA-2026:23388

https://access.redhat.com/errata/RHSA-2026:22649

https://access.redhat.com/errata/RHSA-2026:22305

https://access.redhat.com/errata/RHSA-2026:22143

https://access.redhat.com/errata/RHSA-2026:22142

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS