{"id":"CVE-2026-61722","summary":"FluidSynth: DLS Articulation Chunk Integer Overflow","details":"FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the parser. This issue is fixed in version 2.5.6.","aliases":["GHSA-hp72-35pr-6h6r"],"modified":"2026-10-22T16:31:15.748777595Z","published":"2026-09-18T20:01:58.603Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61722.json"},"references":[{"type":"WEB","url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61722.json"},{"type":"ADVISORY","url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61722"},{"type":"FIX","url":"https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fluidsynth/fluidsynth","events":[{"introduced":"df432e151dcaf463b1ecc7e873803bfa19733fd3"},{"fixed":"e5b11058a619246cea42976dacb76ca54be3d45d"},{"fixed":"4d7084fca7c876f5d738498b4917a39faf603425"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"2.5.0"},{"fixed":"2.5.6"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"4d7084fca7c876f5d738498b4917a39faf603425"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v2.5.6","range":[{"fixed":"e5b11058a619246cea42976dacb76ca54be3d45d"}],"source":"REFERENCES_TAG"}]}}],"versions":["v2.5.5","v2.5.4","v2.5.3","v2.5.2","v2.5.1","v2.5.0"],"database_specific":{"vanir_signatures":[{"target":{"file":"src/sfloader/fluid_dls.cpp","function":"fluid_dls_font::fluid_dls_font"},"deprecated":false,"digest":{"function_hash":"291752453474474538103279760454856829485","length":8535},"id":"CVE-2026-61722-25cb3645","signature_type":"Function","signature_version":"v1","source":"https://github.com/fluidsynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425"},{"deprecated":false,"digest":{"function_hash":"4143172673498825477983535276274844007","length":1298},"id":"CVE-2026-61722-92bb3b68","signature_type":"Function","signature_version":"v1","source":"https://github.com/fluidsynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","target":{"file":"src/sfloader/fluid_dls.cpp","function":"fluid_dls_font::parse_art"}},{"signature_type":"Line","signature_version":"v1","source":"https://github.com/fluidsynth/fluidsynth/commit/e5b11058a619246cea42976dacb76ca54be3d45d","target":{"file":"src/sfloader/fluid_dls.cpp"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["65741976735742723877597808461499147360","158873129713208397340236107564649355567","27858880504209789441457038429492907366","242142550883552540884961556422285883183"]},"id":"CVE-2026-61722-ae4f73c0"},{"target":{"file":"src/sfloader/fluid_dls.cpp","function":"fluid_dls_font::fluid_dls_font"},"deprecated":false,"digest":{"function_hash":"109398306651516327573478367773148522902","length":9029},"id":"CVE-2026-61722-b1a5b579","signature_type":"Function","signature_version":"v1","source":"https://github.com/fluidsynth/fluidsynth/commit/e5b11058a619246cea42976dacb76ca54be3d45d"},{"digest":{"line_hashes":["38593234379792961202803941234406720634","243747660334231508494912288289287081902","182723958878962167924327124786620642413","248071924395223770614732522877171836779","9000562208444802484932277332815206684","45512299199837425728687717589463229095","199422519265221394218866112860645167552","86942096167390518669825173543937223233"],"threshold":0.9},"id":"CVE-2026-61722-f1f9c12e","signature_type":"Line","signature_version":"v1","source":"https://github.com/fluidsynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","target":{"file":"src/sfloader/fluid_dls.cpp"},"deprecated":false}],"vanir_signatures_modified":"2026-10-22T16:31:15Z","source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-61722.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"}]}