{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-61720", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-10T18:51:13.920Z", "datePublished": "2026-09-18T20:03:43.989Z", "dateUpdated": "2026-09-21T16:27:25.573Z"}, "containers": {"cna": {"title": "FluidSynth: SF2 DMOD Chunk Unsigned Underflow", "problemTypes": [{"descriptions": [{"cweId": "CWE-191", "lang": "en", "description": "CWE-191: Integer Underflow (Wrap or Wraparound)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-rmc4-c8hw-455w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-rmc4-c8hw-455w"}, {"name": "https://github.com/FluidSynth/fluidsynth/commit/096e1ff0d09ddcac83d94923440706f76f94bc44", "tags": ["x_refsource_MISC"], "url": "https://github.com/FluidSynth/fluidsynth/commit/096e1ff0d09ddcac83d94923440706f76f94bc44"}, {"name": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"}], "affected": [{"vendor": "FluidSynth", "product": "fluidsynth", "versions": [{"version": ">= 2.5.0, < 2.5.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T20:03:43.989Z"}, "descriptions": [{"lang": "en", "value": "FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the SF2 parser computes the DMOD modulator count as chunk.size / SF_MOD_SIZE - 1 without rejecting chunks smaller than one record. A crafted SF2 file containing a zero-sized DMOD chunk makes the unsigned subtraction wrap to UINT_MAX, and the parser then attempts billions of SFMod allocations. This exhausts process memory and causes denial of service. No workaround is available. This issue is fixed in version 2.5.6."}], "source": {"advisory": "GHSA-rmc4-c8hw-455w", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-21T16:27:05.665077Z", "id": "CVE-2026-61720", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-21T16:27:25.573Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.5.0,2.5.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "fluidsynth", "source": "cna", "vendor": "FluidSynth"}, "product": "fluidsynth", "vendor": "fluidsynth"}], "created": "2026-09-19T10:45:06.344341+00:00", "updated": "2026-09-20T02:45:18.108083+00:00", "vendors": ["fluidsynth", "fluidsynth$PRODUCT$fluidsynth"]}