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SoapServer session-persisted object use-after-free via SOAP header fault

Published May 10, 2026

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, when SoapServer is configured with SOAP_PERSISTENCE_SESSION, the handler object is persisted across requests via session storage. However, in the case SOAP requests results in an error, the persistance is handled incorrectly, resulting in freeing the object while keeping a pointer to it, which may lead to use-after-free. This may lead to memory corruption, information disclosure, or process crashes, with confidentiality, integrity, and availability impact on the vulnerable system.

Affected products

Remediation

Red Hat statement

This flaw only affects PHP users who have configured their runtime with the `SOAP_PERSISTENCE_SESSION` option which is not enabled by default. This flaw can lead to memory corruption, information disclosure, or service crashes. Normally, a SOAP server will only handle one SOAP request per PHP request, so it's unlikely that the attacker will be able to control the freed memory segment. Red Hat systems also employ address space layout randomization (ASLR) which makes accessing freed memory segments improbable.

Red Hat mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Weaknesses (2)

CWE-416

Use After Free

CWE-825

References (5)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner php
Published May 10, 2026
Updated May 11, 2026
Reserved Apr 28, 2026
Link CVE-2026-7261
CISA Vulnrichment
Updated May 11, 2026
NVD
Status Analyzed
Modified Jul 24, 2026
Link CVE-2026-7261
Red Hat
Severity Moderate
Public date May 10, 2026
Links CVE-2026-7261 - Bugzilla