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Fencer Intel
high 8.5

CVE-2026-55543 json

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

published 4mo ago modified 14d ago also EUVD-2026-102925 , GHSA-v66p-c82h-w3cq

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository helge17/tuxguitar. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
8.5
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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.

Patch / fix

  • tuxguitar Debian 14 2.1.1+dfsg1-1

debian advisories DEBIAN-CVE-2026-55543

  • tuxguitar openSUSE Tumbleweed 2.1.0-1.1

opensuse advisories openSUSE-SU-2026:11645-1

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
14d ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/helge17/tuxguitar/security/advisories/GHSA-v66p-c82h-w3cq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.5 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.5 CVSS: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

Affected products

  • helge17 tuxguitar

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code
  • CWE-470 Use of Externally-Controlled Input to Select Classes or Code

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of helge17/tuxguitar published their own advisory on GitHub. Reviewed sources take precedence over it.