{"id":"CVE-2026-61722","state":"PUBLISHED","title":"FluidSynth: DLS Articulation Chunk Integer Overflow","description":"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.","publishedAt":"2026-09-18T20:01:58.603Z","updatedAt":"2026-09-22T15:44:05.935Z","severity":{"score":6.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["FluidSynth fluidsynth"],"affected":[{"vendor":"FluidSynth","product":"fluidsynth","versions":[{"version":">= 2.5.0, < 2.5.6","status":"affected"}]}],"references":["https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r","https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/61xxx/CVE-2026-61722.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-61722","state":"PUBLISHED","datePublished":"2026-09-18T20:01:58.603Z","dateUpdated":"2026-09-22T15:44:05.935Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-10T18:51:13.921Z"},"containers":{"cna":{"title":"FluidSynth: DLS Articulation Chunk Integer Overflow","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"FluidSynth","product":"fluidsynth","versions":[{"version":">= 2.5.0, < 2.5.6","status":"affected"}]}],"references":[{"url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r","name":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","name":"https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","tags":["x_refsource_MISC"]},{"url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6","name":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-18T20:01:58.603Z"},"source":{"advisory":"GHSA-hp72-35pr-6h6r","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T15:43:44.365934Z","id":"CVE-2026-61722","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T15:44:05.935Z"}}]}}}