{
  "cveId": "CVE-2026-106554",
  "url": "https://patchblox.com/security/cve/CVE-2026-106554",
  "summary": "CVE-2026-106554 is fixed in jackson-dataformats-binary on 1 platform by DEBIAN-CVE-2026-106554 (version 2.22.4-1), released November 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "jackson-dataformats-binary: One CBOR-parsing issue in jackson-dataformats-binary\u0027s CBOR module: an unbounded run of CBOR tags drives quadratic-ti...",
  "description": "One CBOR-parsing issue in jackson-dataformats-binary\u0027s CBOR module: an unbounded run of CBOR tags drives quadratic-time TagList growth (CPU/GC-exhaustion DoS, PoC-proven).    PoC executed against com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:2.18.2; present in current 2.x and 3.x (tools.jackson.dataformat.cbor) HEAD. Distinct from the Avro and Smile/Protobuf advisories for this repo.    Quadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -\u003E TagList).    CBOR permits a data item to be preceded by any number of semantic tags. The CBOR parser accumulates them in a TagList whose backing array grows by a fixed increment (\u002B8), not by doubling, and re-scans/copies on each growth. An attacker sends a value preceded by a long run of tag bytes; the fixed-increment growth makes accumulating N tags O(N^2) in time (plus GC pressure), with no cap on the number of stacked tags.    PoC (executed, JDK 17): feeding a CBOR stream consisting of a long run of tag bytes (e.g. tag 0xC0\u002B) before a trivial value forces quadratic CPU/GC; parse time grows super-linearly with the tag count, pinning a request thread with no configurable limit.    Impact. Algorithmic-complexity denial of service (CWE-407): a modest input of stacked tags consumes quadratic CPU/GC, pinning a request thread; concurrent requests exhaust the pool.    Fix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).",
  "published": "2026-11-04T16:17:32Z",
  "severity": "",
  "epss": 0.0038,
  "epssPercentile": 0.32418,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "jackson-dataformats-binary",
      "release": "Debian 14",
      "fixedVersion": "2.22.4-1",
      "fix": "DEBIAN-CVE-2026-106554",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-106554",
      "released": "2026-11-08T01:21:48Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T19:49:26Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}