Updated: 2025-08-20 00:30:58.553913
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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | HIGH | 7.5 |
| CVSS Version 3.x | CRITICAL | 9.8 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| CentOS 8.4 ELS | php | 7.4.6 | 9.8 | CRITICAL | Released | CLSA-2025:1749743304 | 2025-06-13 04:08:33 | |
| CentOS 8.5 ELS | php | 7.4.19 | 9.8 | CRITICAL | Released | CLSA-2025:1749743798 | 2025-06-13 04:08:39 | |
| Debian 10 ELS | php | 7.3 | 9.8 | CRITICAL | Not Vulnerable | 2025-10-15 20:16:49 | ||
| Ubuntu 16.04 ELS | php | 7.0.33 | 9.8 | CRITICAL | Released | CLSA-2022:1646085834 | 2022-02-28 20:38:56 |