osv-2026-2
Vulnerability from osv_ossfuzz
Published
2026-01-03 00:15
Modified
2026-01-03 00:15
Summary
Heap-buffer-overflow in cmt_mpack_consume_uint_tag
Details

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=472785094

Crash type: Heap-buffer-overflow WRITE 8
Crash state:
cmt_mpack_consume_uint_tag
cmt_mpack_unpack_array
cmt_mpack_unpack_map
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "fixed_range": "2d3b2338c85b85c688171bef0ef3e221dc410a51:d6e65fb019a28ec2b16221e2753d4e3284e06ad0",
        "introduced_range": "ae1445463ca03bac9b46147166c0ee00993363e8:10ebd3a354f2a052ac865960145fda844b3b120e"
      },
      "ecosystem_specific": {
        "severity": "HIGH"
      },
      "package": {
        "ecosystem": "OSS-Fuzz",
        "name": "fluent-bit",
        "purl": "pkg:generic/fluent-bit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "ef3f0750c741ae4586a093adf747bb77c932bec7"
            },
            {
              "fixed": "d6e65fb019a28ec2b16221e2753d4e3284e06ad0"
            }
          ],
          "repo": "https://github.com/fluent/fluent-bit/",
          "type": "GIT"
        }
      ],
      "versions": [
        "v4.2.1",
        "v4.2.2"
      ]
    }
  ],
  "details": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=472785094\n\n```\nCrash type: Heap-buffer-overflow WRITE 8\nCrash state:\ncmt_mpack_consume_uint_tag\ncmt_mpack_unpack_array\ncmt_mpack_unpack_map\n```\n",
  "id": "OSV-2026-2",
  "modified": "2026-01-03T00:15:15.908130Z",
  "published": "2026-01-03T00:15:15.907754Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=472785094"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "Heap-buffer-overflow in cmt_mpack_consume_uint_tag"
}


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