CVE-2026-55543: Code Injection

Description

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.

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Weakness Type (CWE)

CWE-94 CWE-94

CWE-470 CWE-470

References

Other References

https://github.com/helge17/tuxguitar/commit/a7eef20e2e02ee454597d42c295327d9f098c636 https://github.com/helge17/tuxguitar/releases/tag/2.1.0 https://github.com/helge17/tuxguitar/security/advisories/GHSA-v66p-c82h-w3cq

Frequently Asked Questions

What is CVE-2026-55543? +

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.

How do I check if I'm vulnerable to CVE-2026-55543? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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