data/osv/GO-2026-5048.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-5048",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "GHSA-mx64-mj3q-7prj"
  ],
  "summary": "Denial of service via unbounded map allocations in github.com/iskorotkov/avro/v2 and github.com/hamba/avro/v2",
  "details": "The Avro map decoder accepts attacker-controlled block-element counts from the wire format and grows the destination map without enforcing an upper bound. A producer can declare an arbitrarily large map (in one block, or chunked across many sub-limit blocks) and exhaust process memory until the OOM killer fires.\n\nThe fix introduces Config.MaxMapAllocSize with cumulative enforcement across block boundaries. The new limit is opt-in: the field defaults to zero, which preserves the previous unbounded behavior for backward compatibility. Upgrading to v2.33.0 alone does not mitigate the issue; consumers of untrusted Avro data must explicitly set MaxMapAllocSize on their avro.Config.",
  "affected": [
    {
      "package": {
        "name": "github.com/iskorotkov/avro/v2",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.33.0"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "github.com/iskorotkov/avro/v2"
          }
        ]
      }
    },
    {
      "package": {
        "name": "github.com/hamba/avro/v2",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "github.com/hamba/avro/v2"
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/iskorotkov/avro/security/advisories/GHSA-mx64-mj3q-7prj"
    },
    {
      "type": "FIX",
      "url": "https://github.com/iskorotkov/avro/commit/5192df96a158999344ac96ebcb1f7461d626f6d7"
    }
  ],
  "credits": [
    {
      "name": "Ivan Korotkov"
    },
    {
      "name": "Daniel Błażewicz"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-5048",
    "review_status": "REVIEWED"
  }
}