{"id":"CVE-2026-61722","published":"2026-09-18T20:17:18.713","lastModified":"2026-09-23T18:28:25.093","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.","cvssScore":6.8,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cwes":["CWE-190"],"vendors":[],"products":[],"references":[{"url":"https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","tags":[]},{"url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6","tags":[]},{"url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r","tags":[]}],"exploitRefs":[{"url":"https://github.com/FluidSynth/fluidsynth/commit/4d7084fca7c876f5d738498b4917a39faf603425","tags":[]},{"url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6","tags":[]},{"url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r","tags":[]}],"hasPoc":true,"ai":null}