Security advisory

{
  "id": "cb3d92abf8b08e8a25a23659974bbcdc596012b552e8941aee37b9f0255dec72",
  "url": "https://osv.dev/vulnerability/CVE-2022-34750",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2022-34750",
    "summary": "An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.",
    "evidence": "osv:CVE-2022-34750",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-34750",
      "aliases": [
        "BIT-mediawiki-2022-34750",
        "CVE-2022-34750"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wikimedia/mediawiki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "d7db51b9e2e2089937bbe1a52a81ee420d19a12d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.38.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.38.1",
            "1.38.0",
            "1.38.0-rc.1",
            "1.38.0-rc.0",
            "test-hashar-for-ci",
            "1.6.0",
            "1.5.0beta4",
            "1.5.0beta3",
            "1.5.0beta2",
            "1.5.0beta1",
            "1.5.0alpha2",
            "1.5.0alpha1",
            "1.3.0beta1",
            "1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-34750.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.765477525Z",
      "provider": "osv",
      "references": [
        "https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742",
        "https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9",
        "https://phabricator.wikimedia.org/T308659",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/34xxx/CVE-2022-34750.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-34750"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/34xxx/CVE-2022-34750.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-34750",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 502110,
  "published_at": "2022-06-28T12:20:42+00:00"
}