Bug 2539215

Summary:	CVE-2026-61714 musescore: FluidSynth: Heap Buffer Overflow via MIDI channel configuration [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Vladimir Vasilev <vvasilev>
Component:	musescore	Assignee:	Jerry James <loganjerry>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	loganjerry
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["333ee1ff-95dc-434e-a48b-93221071413d"]}
Fixed In Version:	musescore-4.7.5-3.fc45 musescore-4.7.5-3.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-06 14:02:01 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2538395

Description Vladimir Vasilev 2026-09-23 08:49:06 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-09-28 18:00:17 UTC

FEDORA-2026-6debf34169 (musescore-4.7.5-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-6debf34169

Comment 2 Fedora Update System 2026-09-28 18:00:17 UTC

FEDORA-2026-e5a087cb33 (musescore-4.7.5-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-e5a087cb33

Comment 3 Fedora Update System 2026-09-29 01:35:00 UTC

FEDORA-2026-e5a087cb33 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-e5a087cb33`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-e5a087cb33

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-09-29 02:11:52 UTC

FEDORA-2026-6debf34169 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-6debf34169`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6debf34169

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-10-06 14:02:01 UTC

FEDORA-2026-e5a087cb33 (musescore-4.7.5-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-10-07 01:39:20 UTC

FEDORA-2026-6debf34169 (musescore-4.7.5-3.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.