Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loader

{
  "id": "4cad5a622ac4d2d06213492898c3c37895624d9bcb9d0fc01d0e2d9000bcd70f",
  "url": "https://osv.dev/vulnerability/CVE-2026-112007",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loader",
    "summary": "Schism Tracker through 20260524 contains a heap out-of-bounds write vulnerability in fmt_ult_load_song() in fmt/ult.c that fails to clamp the one-byte sample count to MAX_SAMPLES. Attackers can supply a crafted .ult module that overwrites the instruments pointer array, causing csf_destroy() to free attacker-chosen pointers and crash the application.",
    "evidence": "osv:CVE-2026-112007",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-112007",
      "aliases": [
        "CVE-2026-112007"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/schismtracker/schismtracker",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "74215ae300b555928332e03152dfcdc898f96ca6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "20260524"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "20260524"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "20260524",
            "20251014",
            "20250825",
            "20250728",
            "20250415",
            "20250313",
            "20250307",
            "20250305",
            "20250208",
            "20250202",
            "20241226",
            "20241225",
            "20241021",
            "20240809",
            "20240630",
            "20240614",
            "20240609",
            "20240529",
            "20240523",
            "20240515",
            "20240503",
            "20240426",
            "20240409",
            "20240328",
            "20240129",
            "20231029",
            "20230906",
            "20221020",
            "20221201",
            "20220905",
            "20220807",
            "sdl1",
            "20220506",
            "20220125",
            "20211116",
            "20211115",
            "deploy-test-6",
            "deploy-test-5",
            "20200412",
            "20190805",
            "20190722",
            "20190614",
            "issue-175.1",
            "issue-175.0",
            "20181223",
            "macosx-deploy-test",
            "20180810",
            "20180513",
            "20180209",
            "deploy-test-4",
            "20170910",
            "deploy-test-3",
            "deploy-test-2",
            "deploy-test-1",
            "20170420",
            "20160913",
            "20160521",
            "hg-import"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112007.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.559014889Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112007.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112007",
        "https://www.vulncheck.com/advisories/schism-tracker-through-20260524-heap-out-of-bounds-write-via-ult-loader",
        "https://github.com/schismtracker/schismtracker",
        "https://github.com/schismtracker/schismtracker/blob/74215ae300b555928332e03152dfcdc898f96ca6/fmt/ult.c#L319-L330",
        "https://hackmd.io/@haindpwn/schismtracker-ult-sample-count-oob-write"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112007.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112007",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 502017,
  "published_at": "2026-10-18T11:38:30.59+00:00"
}