{"id":"DEBIAN-CVE-2026-61714","details":"FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.","modified":"2026-09-26T08:47:27.875779691Z","published":"2026-09-18T20:17:18.270Z","upstream":["CVE-2026-61714"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-61714"}],"affected":[{"package":{"name":"fluidsynth","ecosystem":"Debian:12","purl":"pkg:deb/debian/fluidsynth?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.1-2","2.3.2-1","2.3.3-1","2.3.3-2","2.3.3-2.1","2.3.4-1","2.3.5-1","2.3.6-1","2.4.0-1","2.4.0-1~hurd.1","2.4.0-1~hurd.2","2.4.2-1","2.4.3+dfsg-1","2.4.3+dfsg-2","2.4.3+dfsg-3","2.4.3+dfsg-4","2.4.3-1","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","2.5.6+dfsg-1","2.5.7+dfsg-1","2.6.0+dfsg-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61714.json"}},{"package":{"name":"fluidsynth","ecosystem":"Debian:13","purl":"pkg:deb/debian/fluidsynth?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.4+dfsg-1+deb13u3"}]}],"versions":["2.4.4+dfsg-1","2.4.4+dfsg-1+deb13u1","2.4.4+dfsg-1+deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61714.json"}},{"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-2026-61714.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}