CVE-2026-61722

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{"affected": [{"affectedData": [{"product": "fluidsynth", "vendor": "FluidSynth", "versions": [{"status": "affected", "version": ">= 2.5.0, < 2.5.6"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-61722", "lastModified": "2026-09-23T18:28:25.093", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.5, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-61722", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-22T15:43:44.365934Z", "version": "2.0.3"}}]}, "published": "2026-09-18T20:17:18.713", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425"}, {"source": "security-advisories@github.com", "url": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"}, {"source": "security-advisories@github.com", "url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"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": "2026-09-19T11:30:06.474787+00:00", "updated": "2026-09-20T02:45:18.109195+00:00", "vendors": ["fluidsynth", "fluidsynth$PRODUCT$fluidsynth"]}