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Review reviewCritical

CVE-2026-6722

PHP Group PHP, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8

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...

CVSS
9.5
EPSS
0.74%
50.4% percentile
CISA KEV
Not listed
Published
2026.05.10
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.74%
Technical severityCVSS 9.5

Vulnerability overview

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...

Affected product and versions

Product
PHP Group PHP, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8
Affected versions
>= 8.2.* < 8.2.31, >= 8.3.* < 8.3.31, >= 8.4.* < 8.4.21, >= 8.5.* < 8.5.6, >= 8.2.0 < 8.2.31, >= 8.3.0 < 8.3.31, >= 8.4.0 < 8.4.21, >= 8.5.0 < 8.5.6
Fixed versions
8.2.31, 8.3.31, 8.4.21, 8.5.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that PHP Group PHP, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/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
CWE
CWE-416, CWE-825
CVE-2026-6722 — PHP Group PHP, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 | SECUFOCUS NOW