Heap-buffer-overflow in mk_rconf_read

{
  "id": "109ac10190f9c0fe526420fa2aecf9986644c30ec65533a197f9719670f9cf4b",
  "url": "https://osv.dev/vulnerability/OSV-2021-855",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap-buffer-overflow in mk_rconf_read",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35185 ``` Crash type: Heap-buffer-overflow READ 1 Crash state: mk_rconf_read mk_rconf_open flb_parser_conf_file ```",
    "evidence": "osv:OSV-2021-855",
    "products": [
      {
        "name": {
          "value": "fluent-bit",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.8.9-dev-6b56f51",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "20220215",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "tiger-1.8.15-20221123",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "tiger-1.8.15-20221220",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "tiger-1.8.15-20230223",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "unstable-1.8",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "unstable-leonardo-cio-log-poc",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.0-rc1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.10",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.11",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.12",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.13",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.14",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.15",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.7",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.8",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v1.8.9-dev-6b56f51",
            "evidence": "/affected/0/versions"
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            "value": "tiger-1.8.15-20230329",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
          },
          {
            "value": "tiger-1.8.15-20230518",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2021-855",
      "aliases": [
        "OSV-2021-855"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fluent/fluent-bit/",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8f653c34c0dd46c39e2a5ebf9ff3fe9ec932fc4f"
                },
                {
                  "introduced": "ed82460da17f5a029df74503d3a5f8f69d29d3ea"
                },
                {
                  "fixed": "1c3811ba12bf924a96c916e2409a0d41c336debf"
                }
              ]
            }
          ],
          "package": {
            "name": "fluent-bit",
            "purl": "pkg:generic/fluent-bit",
            "ecosystem": "OSS-Fuzz"
          },
          "versions": [
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            "20220215",
            "tiger-1.8.15-20221123",
            "tiger-1.8.15-20221220",
            "tiger-1.8.15-20230223",
            "unstable-1.8",
            "unstable-leonardo-cio-log-poc",
            "v1.8.0",
            "v1.8.0-rc1",
            "v1.8.1",
            "v1.8.10",
            "v1.8.11",
            "v1.8.12",
            "v1.8.13",
            "v1.8.14",
            "v1.8.15",
            "v1.8.2",
            "v1.8.3",
            "v1.8.4",
            "v1.8.5",
            "v1.8.6",
            "v1.8.7",
            "v1.8.8",
            "v1.8.9",
            "v1.8.9-dev-6b56f51",
            "tiger-1.8.15-20230329",
            "tiger-1.8.17",
            "tiger-1.8.16-20230518",
            "tiger-1.8.15-20230518"
          ],
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-855.yaml"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-20T17:24:22.768908106Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35185"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 389807,
  "published_at": "2021-06-14T00:00:18.084172+00:00"
}