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CVE-2026-55543

TuxGuitar: Arbitrary Code Execution via maliciously crafted `.tg` file

8.5 HighFix available

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.21%Up 0.1 points since Oct 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

TuxGuitar: Arbitrary Code Execution via maliciously crafted `.tg` file

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
CVE-2026-55543
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-94, CWE-470
Updated
2026-11-02
EUVDEUVD-2026-102925 8.5

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
EUVD-2026-102925
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 8.5

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
CVE-2026-55543
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-94, CWE-470
Updated
2026-11-02
OSV 8.5

TuxGuitar: Arbitrary Code Execution via maliciously crafted `.tg` file

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
CVE-2026-55543
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-470, CWE-94
Updated
2026-11-02
OSVDEBIAN-CVE-2026-55543 8.5

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
DEBIAN-CVE-2026-55543
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-55543 8.5

TuxGuitar is an open-source guitar tablature editor. Prior to 2.1.0, an untrusted .tg file can set gervil.soundbank.path to reference an on-disk archive, including the .tg file itself, whose META-INF/services/javax.sound.midi.Soundbank entry names an attacker-supplied class stored in that archive. When a user opens the file, JARSoundbankReader uses an unverified class loader to load and instantiate that class, executing its constructor with the privileges of the TuxGuitar process. This issue is fixed in version 2.1.0.

Record
UBUNTU-CVE-2026-55543
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVopenSUSE-SU-2026:11645-1 No score

tuxguitar-2.1.0-1.1 on GA media

These are all security issues fixed in the tuxguitar-2.1.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11645-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tuxguitar
Debian:12
 All versions, plus listed versions
1.5.6+dfsg1-61.5.6+dfsg1-71.5.6+dfsg1-81.6.4+dfsg1-11.6.6+dfsg1-1
Show 5 moreShow less
1.6.6+dfsg1-21.6.6+dfsg1-32.0.0+dfsg1-12.0.0+dfsg1-22.0.0+dfsg1-3
 None known
tuxguitar
Debian:13
 All versions, plus listed versions
1.6.6+dfsg1-32.0.0+dfsg1-12.0.0+dfsg1-22.0.0+dfsg1-3
 None known
tuxguitar
Debian:14
 All versions, plus listed versions
1.6.6+dfsg1-32.0.0+dfsg1-12.0.0+dfsg1-22.0.0+dfsg1-3
 None known
tuxguitar
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.2-20build11.2-21
 None known
tuxguitar
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.2-221.2-23
 None known
tuxguitar
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.2-231.2-241.2-24ubuntu11.2-251.2-25build1
 None known
tuxguitar
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.2-25build11.2-25build2
 None known
tuxguitar
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.5.6+dfsg1-61.5.6+dfsg1-71.5.6+dfsg1-81.5.6+dfsg1-8build21.5.6+dfsg1-8build3
 None known
tuxguitar
Ubuntu:26.10
 All versions, plus listed versions
2.0.0+dfsg1-3
 None known
tuxguitar
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.6.6+dfsg1-32.0.0+dfsg1-12.0.0+dfsg1-22.0.0+dfsg1-3
 None known
tuxguitar
openSUSE:Tumbleweed
 before 2.1.0-1.1
2.1.0-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-55543 is a high vulnerability (CVSS 8.5) in Helge17 Tuxguitar, published August 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. Fixed in tuxguitar 2.1.0-1.1.

References

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