An update for fluidsynth is now available for openEuler-24.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-3167 Final 1.0 1.0 2026-07-24 Initial 2026-07-24 2026-07-24 openEuler SA Tool V1.0 2026-07-24 fluidsynth security update An update for fluidsynth is now available for openEuler-24.03-LTS-SP4 FluidSynth is a free software synthesizer. Its currently based on the SoundFont 2 specifications and supports real time MIDI effect controls. It can be used as a shared library for embedding in other applications, can play MIDI files and has a command line shell. Many other applications use FluidSynth for audio synthesis. Security Fix(es): A heap-based buffer overflow was discovered in fluidsynth's MIDI player. When the synth is configured with `synth.midi-channels > 16` an out-of-bounds memory access is performed on the array `_fluid_player_t::channel_isplaying` in heap memory invoking undefined behavior. No crafted MIDI file is required to expose this vulnerability.(CVE-2026-61714) An unsigned integer overflow in fluidsynth's SF2 parser was discovered. The DMOD chunk handler calculates modulator count as `chunk.size / SF_MOD_SIZE - 1`. When `chunk.size = 0`, the division yields 0 and the unsigned subtraction wraps to `UINT_MAX` (4,294,967,295). The guard check passes because `0 % 10 == 0`. The loop iterates billions of times, allocating an `SFMod` struct per iteration until causing a denial of service via out-of-memory.(CVE-2026-61720) Fluidsynth's native DLS loader sets sample loop points from file-sourced `wsmp.loop_start` and `wsmp.loop_length` values without calling `fluid_sample_validate()` or `fluid_sample_sanitize_loop()`. Crafted DLS files with loop values exceeding the sample buffer cause out-of-bounds reads during audio rendering, invoking undefined behavior and denial of service.(CVE-2026-61721) An integer overflow was discovered in fluidsynth's native DLS parser. The expression `cbsize + connblocks * 12` overflows for `connblocks = 0x40000001`. The loop reads 12 bytes per iteration for ~1 billion iterations (~12.8 GB total) past the chunk boundary.(CVE-2026-61722) An integer overflow was discovered in fluidsynth's native DLS parser. The ptbl chunk validation uses `uint32_t` arithmetic: `cues * 4 + cbsize != subchunk.size`. For `cues = 0x40000002` and `cbsize = 8`, the multiplication overflows: `0x40000002 * 4 = 0x100000008`, truncated to `0x8`. The check `8 + 8 = 16 == subchunk.size` passes. The subsequent `poolcues.resize(cues)` attempts a ~4GB allocation, and the loop reads billions of entries past the file's chunk boundary.(CVE-2026-61723) An update for fluidsynth is now available for openEuler-24.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High fluidsynth https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-61714 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-61720 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-61721 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-61722 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-61723 https://nvd.nist.gov/vuln/detail/CVE-2026-61714 https://nvd.nist.gov/vuln/detail/CVE-2026-61720 https://nvd.nist.gov/vuln/detail/CVE-2026-61721 https://nvd.nist.gov/vuln/detail/CVE-2026-61722 https://nvd.nist.gov/vuln/detail/CVE-2026-61723 openEuler-24.03-LTS-SP4 fluidsynth-help-2.5.6-1.oe2403sp4.noarch.rpm fluidsynth-2.5.6-1.oe2403sp4.aarch64.rpm fluidsynth-debuginfo-2.5.6-1.oe2403sp4.aarch64.rpm fluidsynth-debugsource-2.5.6-1.oe2403sp4.aarch64.rpm fluidsynth-devel-2.5.6-1.oe2403sp4.aarch64.rpm fluidsynth-2.5.6-1.oe2403sp4.src.rpm fluidsynth-2.5.6-1.oe2403sp4.x86_64.rpm fluidsynth-debuginfo-2.5.6-1.oe2403sp4.x86_64.rpm fluidsynth-debugsource-2.5.6-1.oe2403sp4.x86_64.rpm fluidsynth-devel-2.5.6-1.oe2403sp4.x86_64.rpm A heap-based buffer overflow was discovered in fluidsynth's MIDI player. When the synth is configured with `synth.midi-channels > 16` an out-of-bounds memory access is performed on the array `_fluid_player_t::channel_isplaying` in heap memory invoking undefined behavior. No crafted MIDI file is required to expose this vulnerability. 2026-07-24 CVE-2026-61714 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H fluidsynth security update 2026-07-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167 An unsigned integer overflow in fluidsynth's SF2 parser was discovered. The DMOD chunk handler calculates modulator count as `chunk.size / SF_MOD_SIZE - 1`. When `chunk.size = 0`, the division yields 0 and the unsigned subtraction wraps to `UINT_MAX` (4,294,967,295). The guard check passes because `0 % 10 == 0`. The loop iterates billions of times, allocating an `SFMod` struct per iteration until causing a denial of service via out-of-memory. 2026-07-24 CVE-2026-61720 openEuler-24.03-LTS-SP4 Medium 6.2 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H fluidsynth security update 2026-07-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167 Fluidsynth's native DLS loader sets sample loop points from file-sourced `wsmp.loop_start` and `wsmp.loop_length` values without calling `fluid_sample_validate()` or `fluid_sample_sanitize_loop()`. Crafted DLS files with loop values exceeding the sample buffer cause out-of-bounds reads during audio rendering, invoking undefined behavior and denial of service. 2026-07-24 CVE-2026-61721 openEuler-24.03-LTS-SP4 High 8.0 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H fluidsynth security update 2026-07-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167 An integer overflow was discovered in fluidsynth's native DLS parser. The expression `cbsize + connblocks * 12` overflows for `connblocks = 0x40000001`. The loop reads 12 bytes per iteration for ~1 billion iterations (~12.8 GB total) past the chunk boundary. 2026-07-24 CVE-2026-61722 openEuler-24.03-LTS-SP4 Medium 6.8 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H fluidsynth security update 2026-07-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167 An integer overflow was discovered in fluidsynth's native DLS parser. The ptbl chunk validation uses `uint32_t` arithmetic: `cues * 4 + cbsize != subchunk.size`. For `cues = 0x40000002` and `cbsize = 8`, the multiplication overflows: `0x40000002 * 4 = 0x100000008`, truncated to `0x8`. The check `8 + 8 = 16 == subchunk.size` passes. The subsequent `poolcues.resize(cues)` attempts a ~4GB allocation, and the loop reads billions of entries past the file's chunk boundary. 2026-07-24 CVE-2026-61723 openEuler-24.03-LTS-SP4 Medium 6.8 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H fluidsynth security update 2026-07-24 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3167