Heap-buffer-overflow in yaml_emitter_emit_flow_mapping_key

{
  "id": "62609b4c59e44a9e08fca2ac02d128b5f4bbf159c37cfbe9961668ce65d8ad1c",
  "url": "https://osv.dev/vulnerability/OSV-2020-1611",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap-buffer-overflow in yaml_emitter_emit_flow_mapping_key",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24869 ``` Crash type: Heap-buffer-overflow READ 4 Crash state: yaml_emitter_emit_flow_mapping_key yaml_emitter_state_machine yaml_emitter_emit ```",
    "evidence": "osv:OSV-2020-1611",
    "products": [
      {
        "name": {
          "value": "libyaml",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.2.6-rc.1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2020-1611",
      "aliases": [
        "OSV-2020-1611"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yaml/libyaml",
              "type": "GIT",
              "events": [
                {
                  "introduced": "acd6f6f014c25e46363e718381e0b35205df2d83"
                }
              ]
            }
          ],
          "package": {
            "name": "libyaml",
            "purl": "pkg:generic/libyaml",
            "ecosystem": "OSS-Fuzz"
          },
          "versions": [
            "0.2.6-rc.1"
          ],
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libyaml/OSV-2020-1611.yaml"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-19T14:17:00.405720Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24869"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 374775,
  "published_at": "2020-08-14T00:01:51.615528+00:00"
}