Description
The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.
Remediation
References
Related Vulnerabilities
Jenkins Permissions, Privileges, and Access Controls Vulnerability (CVE-2016-3722)
PostgreSQL Improper Control of Dynamically-Managed Code Resources Vulnerability (CVE-2022-2625)
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Oracle Database Server CVE-2008-0349 Vulnerability (CVE-2008-0349)