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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Game Music Emu",
          "vendor": "Game Music Emu Project",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "advisories"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "----------------------------------------------------------------------------\nNotCVE Advisory \u2014 NotCVE-2026-0019\n----------------------------------------------------------------------------\n\n[-] Summary:\nAn out-of-bounds read in the VGM command interpreter of game-music-emu\n(libgme), the open-source video game music emulation library, allows an\nattacker who supplies a crafted .vgm or .vgz file to read heap memory past\nthe end of the buffer holding the file. The read happens as soon as\nplayback begins. CVSS:3.1 5.4 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L).\n\n[-] Affected:\ngame-music-emu (libgme) through 0.6.5 (present in 0.6.0, 0.6.3 and 0.6.5),\nand master as of commit fe8da4b. Default builds; no fixed version is\nverified.\n\n[-] Technical Description:\nThe command loop of Vgm_Emu_Impl::run_commands() (gme/Vgm_Emu_Impl.cpp) is\nbounded only by\n\n  while ( vgm_time \u003c end_time \u0026\u0026 pos \u003c data_end )\n\nwhich validates the position of the opcode byte and nothing else. Each\nopcode handler then fetches its operands from pos unconditionally. The\nsource records the gap in a TODO at the loop head: \"be sure there are\nenough bytes left in stream for particular command so we don\u0027t read past\nend\".\n\nWhen a command stream ends right after an opcode byte, the operand fetch\ncrosses the end of the allocation made by Gme_File::load_(). Maximum\nover-read per handler:\n\n  - PSG and Game Gear register writes (*pos++): 1 byte\n  - 16-bit delay 0x61 (pos[0], pos[1]): up to 2 bytes\n  - YM2413 and YM2612 register writes: up to 2 bytes\n  - PCM seek 0xE0 (pos[0] .. pos[3]): up to 4 bytes\n  - data block header 0x67 (pos[1], get_le32( pos + 2 )): up to 6 bytes\n\nThe bytes read are consumed as sound-chip register data, so adjacent heap\ncontents can influence the decoded audio (limited, indirect disclosure).\nAddressSanitizer aborts on the over-read; the researcher\u0027s two\nproof-of-concept files reproduce it at two sites (a trailing 0x50 PSG\nwrite and a trailing 0x67 data block header). Under a standard allocator a\nread of this size normally stays within the same chunk, so a crash is\nlayout-dependent rather than reliable. No write, length control or code\nexecution is shown.\n\nReachability: VGM/VGZ support is in the default build. FFmpeg\u0027s\nlibavformat/libgme.c calls gme_open_data() and then gme_start_track()\ninside read_header_gme(), so a server-side transcoder reaches the defect\nwhile merely reading a file\u0027s header. VLC exposes the library through its\ngme demux module, which handles VGM and VGZ.\n\nWeaknesses:\nCWE-125: Out-of-bounds Read\nCWE-126: Buffer Over-read\nCAPEC-540: Overread Buffers\n\n[-] Credit:\nDiscovered by netspacer1124 (https://github.com/netspacer1124).\n\n[-] Full Details and Updates:\nhttps://notcve.org/notcve/NotCVE-2026-0019\n\n[-] Main References:\nhttps://github.com/libgme/game-music-emu\nhttps://raw.githubusercontent.com/libgme/game-music-emu/0.6.5/gme/Vgm_Emu_Impl.cpp\nhttps://ffmpeg.org/doxygen/5.1/libgme_8c_source.html\n\n[-] About NotCVE:\nNotCVE (https://notcve.org) assigns public, timestamped NotCVE IDs to\nvulnerabilities not acknowledged by vendors. Vendor will not assign a CVE?\nRequest a NotCVE: https://notcve.org/form/ \u00b7 Contributors:\nhttps://notcve.org/hall/\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-126",
              "description": "CWE-126",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-02T04:57:33Z",
        "orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
        "shortName": "VULNARCHIVE"
      },
      "references": [
        {
          "tags": [
            "technical-description",
            "exploit"
          ],
          "url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Sep/95"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Sep/95"
        },
        {
          "url": "https://ffmpeg.org/doxygen/5.1/libgme_8c_source.html"
        },
        {
          "url": "https://github.com/libgme/game-music-emu"
        },
        {
          "url": "https://github.com/netspacer1124"
        },
        {
          "url": "https://nmap.org/mailman/listinfo/fulldisclosure"
        },
        {
          "url": "https://notcve.org"
        },
        {
          "url": "https://notcve.org/form/"
        },
        {
          "url": "https://notcve.org/hall/"
        },
        {
          "url": "https://notcve.org/notcve/NotCVE-2026-0019"
        },
        {
          "url": "https://raw.githubusercontent.com/libgme/game-music-emu/0.6.5/gme/Vgm_Emu_Impl.cpp"
        },
        {
          "url": "https://seclists.org/fulldisclosure/"
        }
      ],
      "source": {
        "defect": [
          "https://seclists.org/fulldisclosure/2026/Sep/95"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "[NotCVE-2026-0019] game-music-emu through 0.6.5 VGM Command Interpreter Missing Operand Length Check Allows Heap Out-of-Bounds Read",
      "x_gcve": [
        {
          "recordType": "advisory",
          "relationships": [],
          "vulnId": "GCVE-1988-2026-0423",
          "x_vulnarchive": {
            "archiveUrl": "https://vuln.freearchive.org/archive/full-disclosure/2026/Sep/95",
            "automated": true,
            "contentSha256": "98db2aa0360d4b5883a4049270315097b495f538dac159416177946e491b2bcc",
            "evidenceScore": 10,
            "messageId": "",
            "originalUrl": "https://seclists.org/fulldisclosure/2026/Sep/95",
            "policy": "vulnarchive-1",
            "sourceFormat": "text/html",
            "sourcePublishedAt": "2026-09-29T08:31:36Z"
          }
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
    "assignerShortName": "VULNARCHIVE",
    "datePublished": "2026-10-02T04:57:33Z",
    "dateUpdated": "2026-10-02T04:57:33Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1988-2026-0423"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}