Security advisory

{
  "id": "efb9434314784ab1eb615cb38aaeed03549ef406b698dd290cb119662b9f41eb",
  "url": "https://osv.dev/vulnerability/CVE-2017-8923",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-8923",
    "summary": "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.",
    "evidence": "osv:CVE-2017-8923",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2017-8923",
      "aliases": [
        "CVE-2017-8923"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/php/php-src",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7d959d16546198e8012985109e5689abcae18b5f"
                },
                {
                  "introduced": "5dc92c2117cafc61daaaaa240fd46c3ac33872a4"
                },
                {
                  "fixed": "ca647c529295a4fde269e9a4dfa19fc4f245501c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.4.24"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.0.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "POST_PHP7_NSAPI_REMOVAL",
            "PRE_PHP7_NSAPI_REMOVAL",
            "PRE_PHP7_EREG_MYSQL_REMOVALS",
            "PRE_PHP7_REMOVALS",
            "POST_PHP7_REMOVALS",
            "POST_AST_MERGE",
            "PRE_AST_MERGE",
            "POST_64BIT_BRANCH_MERGE",
            "PRE_64BIT_BRANCH_MERGE",
            "POST_PHPNG_MERGE"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-8923.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:05.817268870Z",
      "provider": "osv",
      "references": [
        "https://security.netapp.com/advisory/ntap-20241227-0007/",
        "https://bugs.php.net/bug.php?id=74577"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-8923",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440841,
  "published_at": "2017-05-12T20:29:00.5+00:00"
}