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Back to active CVEs
High · CVSS 8.5CVE-2026-55543

TuxGuitar: Arbitrary Code Execution via maliciously crafted `.tg` fileCVE-2026-55543

Answer in brief

CVE-2026-55543 records a High severity (CVSS 8.5) vulnerability in TuxGuitar: Arbitrary Code Execution via maliciously crafted `.tg` file. The current sources do not mark it as known exploited. The current feed maps helge17/tuxguitar (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps helge17/tuxguitar (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
helge17/tuxguitargeneric<2.1.02.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for helge17/tuxguitar.
  2. 2Review the reported fix. Update helge17/tuxguitar to 2.1.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-94, CWE-470
Source
CVE List V5
Source checked
Oct 16, 2026
References
3 linked sources
Open source record