{"id":"CVE-2026-61721","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-61721","summary":"FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS loader assigns file-controlled wsmp.loop_start and wsmp.loop_length…","details":"FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS loader assigns file-controlled wsmp.loop_start and wsmp.loop_length values to samples without calling fluid_sample_validate() or fluid_sample_sanitize_loop(). A crafted DLS file can place sample loop points beyond the sample buffer, causing out-of-bounds reads during audio rendering, undefined behavior, possible memory disclosure, and denial of service. Builds compiled with the CMake option enable-native-dls set to OFF do not expose the affected parser. This issue is fixed in version 2.5.6.","published":"2026-09-18T20:17:18.567","modified":"2026-09-18T20:17:18.567","cvss":{"score":8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/FluidSynth/fluidsynth/commit/2354c2a9acdb26de7cdcd37c903ee108f46c0a7d","label":"FluidSynth/fluidsynth@2354c2a"},"references":[{"type":"WEB","url":"https://github.com/FluidSynth/fluidsynth/commit/2354c2a9acdb26de7cdcd37c903ee108f46c0a7d"},{"type":"WEB","url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"},{"type":"WEB","url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-59ph-rx8r-8p4j"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T20:17:18.567"}}