{"id":"DEBIAN-CVE-2026-61721","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.","modified":"2026-09-24T08:47:32.117918885Z","published":"2026-09-18T20:17:18.567Z","upstream":["CVE-2026-61721"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-61721"}],"affected":[{"package":{"name":"fluidsynth","ecosystem":"Debian:14","purl":"pkg:deb/debian/fluidsynth?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.6+dfsg-1"}]}],"versions":["2.4.4+dfsg-1","2.4.6+dfsg-1","2.4.7+dfsg-1","2.4.7+dfsg-2","2.4.8+dfsg-1","2.5.0+dfsg-1","2.5.1+dfsg-1","2.5.1+dfsg-2","2.5.2+dfsg-1","2.5.3+dfsg-1","2.5.4+dfsg-1","2.5.5+dfsg-1","2.5.5+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61721.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H"}]}