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.
| Reporter | Title | Published | Views | Family All 111 |
|---|---|---|---|---|
 | PHP zend_string_extend Heap Buffer Overflow DoS | 10 Aug 201700:00 | – | bdu_fstec |
 | CVE-2017-8923 affecting package php 7.4.14-3 | 12 Jan 202509:15 | – | cbl_mariner |
 | Rocky Linux 8 [CIQ] Security Update: apcu-panel / libzip / libzip-debuginfo / libzip-debugsource / etc Multiple Vulnerabilities (crlsa-2023_2903) | 1 Oct 202600:00 | – | nessus |
| EulerOS 2.0 SP8 : php (EulerOS-SA-2022-2477) | 9 Oct 202200:00 | – | nessus |
| EulerOS Virtualization 3.0.6.0 : php (EulerOS-SA-2023-2243) | 13 Jun 202300:00 | – | nessus |
| openSUSE 15 Security Update : php7 (openSUSE-SU-2022:0699-1) | 5 Mar 202200:00 | – | nessus |
| PHP 7.0.x < 7.0.19 Multiple Vulnerabilities | 25 May 201700:00 | – | nessus |
| PHP 7.1.x < 7.1.5 Multiple Vulnerabilities | 25 May 201700:00 | – | nessus |
| RHEL 8 : php:7.4 (RHSA-2023:2903) | 16 May 202300:00 | – | nessus |
| RHEL 8 : php (Unpatched Vulnerability) | 11 May 202400:00 | – | nessus |
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02 Oct 2025 06:11Current
7.5High risk
Vulners AI Score7.5
CVSS 27.5
CVSS 3.19.8
EPSS0.07191