{"id":"UBUNTU-CVE-2017-8923","details":"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.","modified":"2026-11-06T13:48:46.494983543Z","published":"2017-05-12T20:29:00Z","related":["USN-5300-1","USN-5300-2","USN-5300-3"],"upstream":["CVE-2017-8923"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-8923"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-8923"}],"affected":[{"package":{"name":"php7.0","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/php7.0?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.33-0ubuntu0.16.04.16+esm3"}]}],"versions":["7.0.1-5","7.0.1-6","7.0.2-1","7.0.2-3","7.0.2-4","7.0.2-5","7.0.3-2","7.0.3-3","7.0.3-9ubuntu1","7.0.4-5ubuntu1","7.0.4-5ubuntu2","7.0.4-7ubuntu1","7.0.4-7ubuntu2","7.0.4-7ubuntu2.1","7.0.8-0ubuntu0.16.04.1","7.0.8-0ubuntu0.16.04.2","7.0.8-0ubuntu0.16.04.3","7.0.13-0ubuntu0.16.04.1","7.0.15-0ubuntu0.16.04.1","7.0.15-0ubuntu0.16.04.2","7.0.15-0ubuntu0.16.04.4","7.0.18-0ubuntu0.16.04.1","7.0.22-0ubuntu0.16.04.1","7.0.25-0ubuntu0.16.04.1","7.0.28-0ubuntu0.16.04.1","7.0.30-0ubuntu0.16.04.1","7.0.32-0ubuntu0.16.04.1","7.0.33-0ubuntu0.16.04.1","7.0.33-0ubuntu0.16.04.2","7.0.33-0ubuntu0.16.04.3","7.0.33-0ubuntu0.16.04.4","7.0.33-0ubuntu0.16.04.5","7.0.33-0ubuntu0.16.04.6","7.0.33-0ubuntu0.16.04.7","7.0.33-0ubuntu0.16.04.9","7.0.33-0ubuntu0.16.04.11","7.0.33-0ubuntu0.16.04.12","7.0.33-0ubuntu0.16.04.14","7.0.33-0ubuntu0.16.04.15","7.0.33-0ubuntu0.16.04.16","7.0.33-0ubuntu0.16.04.16+esm1","7.0.33-0ubuntu0.16.04.16+esm2"],"ecosystem_specific":{"availability":"Available 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