Heap-buffer-overflow in uni_utf8_get_char_n

{
  "id": "f8cfd29e6160a2786225c6f2a34d595fe5740a39d0942ea4b4122360c6a00393",
  "url": "https://osv.dev/vulnerability/OSV-2020-843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap-buffer-overflow in uni_utf8_get_char_n",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23513 ``` Crash type: Heap-buffer-overflow READ 1 Crash state: uni_utf8_get_char_n smtp_command_parse_parameters smtp_command_parse_line ```",
    "evidence": "osv:OSV-2020-843",
    "products": [
      {
        "name": {
          "value": "dovecot",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2020-843",
      "aliases": [
        "OSV-2020-843"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dovecot/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f5befde9939b105b490cd475df380c3220275bb6"
                }
              ]
            }
          ],
          "package": {
            "name": "dovecot",
            "purl": "pkg:generic/dovecot",
            "ecosystem": "OSS-Fuzz"
          },
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dovecot/OSV-2020-843.yaml"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-19T14:26:29.468262Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23513"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 374789,
  "published_at": "2020-07-14T22:13:42.180708+00:00"
}