WildMIDI through 0.5.0 Heap Out-of-Bounds Read via _WM_ParseNewHmp

{
  "id": "1e5d571c0fd504205f76ecc7097ec463c740a50130b6af0e2a7f3d6cceac9dca",
  "url": "https://osv.dev/vulnerability/CVE-2026-111162",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "WildMIDI through 0.5.0 Heap Out-of-Bounds Read via _WM_ParseNewHmp",
    "summary": "WildMIDI through 0.5.0 contains a heap out-of-bounds read vulnerability in the HMP parser _WM_ParseNewHmp() that allows attackers to read beyond buffers via underflowed chunk lengths. Attackers can supply a crafted .hmp file with a chunk length of 0-12 that wraps to roughly 4 GB, crashing applications or exposing heap bytes through WildMidi_GetInfo().",
    "evidence": "osv:CVE-2026-111162",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-111162",
      "aliases": [
        "CVE-2026-111162"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mindwerks/wildmidi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "340472ed4633d139d30c660b90eca03c1320e593"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.5.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "wildmidi-0.5.0",
            "wildmidi-0.4.6",
            "wildmidi-0.4.5",
            "wildmidi-0.4.4",
            "wildmidi-0.4.3",
            "wildmidi-0.4.2",
            "wildmidi-0.4.1",
            "wildmidi-0.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111162.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.972250069Z",
      "provider": "osv",
      "references": [
        "https://github.com",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111162.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111162",
        "https://www.vulncheck.com/advisories/wildmidi-through-0.5.0-heap-out-of-bounds-read-via-wm-parsenewhmp",
        "https://github.com/Mindwerks/wildmidi",
        "https://github.com/Mindwerks/wildmidi/blob/340472ed4633d139d30c660b90eca03c1320e593/src/f_hmp.c#L258-L261",
        "https://github.com/Mindwerks/wildmidi/blob/340472ed4633d139d30c660b90eca03c1320e593/src/internal_midi.c#L2166-L2172",
        "https://hackmd.io/@haind-pwn/wildmidi-hmp-chunk-length-underflow-oob-read"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111162.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111162",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517537,
  "published_at": "2026-10-15T18:57:49.774+00:00"
}