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Filepaths get incorrectly decoded leading to files being extracted in the wrong directory

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Bewertung

Schwierigkeit
3/5
Geschätzter Aufwand
1-2 Tage
Anfängerfreundlichkeit
68/100
Issue-Typ
Bug
Klarheit
Größtenteils klar
Aktivitätsstatus
Aktiv
Tech-Stack
python
Bereich
backend

Rechercherichtung

Start by extracting the attached minimal archive after repackaging it as a .tar.xz on Debian 13, then trace how Extractcode decodes archive member paths and handles the +dfsg/LICENSES/Qt- segment. Compare the resulting path with the expected qt6-webengine-6.8.2+dfsg/LICENSES/Qt-GPL-exception-1.0.txt. Done means extraction preserves the directory structure and filename for this example.

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Beschreibung

We are using Extractcode to extract large open source archives.
We have found a case where after extraction files some files from subdirectories are extracted into the extraction root and given very long and partially gibberish names.

This happened specifically upon extracting qt6-webengine 6.8.2+dfsg-4 (http://deb.debian.org/debian/pool/main/q/qt6-webengine/qt6-webengine_6.8.2+dfsg-4.debian.tar.xz).

After extraction the file qt6-webengine-6.8.2+dfsg/LICENSES/Qt-GPL-exception-1.0.txt was found in the extraction root with filename qt6-webengine-6.8.2Min _nyopeQu _ GPL-exception-1.0.txt

After some investigation we found that +dfsg/LICENSES/Qt- is being incorrectly decoded as UTF-7, leading to a full-path of qt6-webengine-6.8.2痻\u20fc눂ე葋\uf42dGPL-exception-1.0.txt which is the transliterated to qt6-webengine-6.8.2Min _nyopeQu _ GPL-exception-1.0.txt This means that the directory structure of the file is entirely lost and the file gets extracted to the extraction root instead of the correct directory.
The same happens for a selection of other files in the archive, but not reliably for every file. We were not able to determine what specifically triggers the issue, our assumption is that it has to do with Kanji encoding in some form (e.g. if the final part of a path can theoretically be decoded as a Kanji it incorrectly assumes it is UTF-7 encoded).

We have attached a minimal example of this (note: we had to package it as a .zip due to file support limitations on github, for testing it should be extracted and then reachived as a .tar.xz) with only this Qt-GPL-exception-1.0.txt file contained for easier verification and testing.
qt6-webengine-6.8.2+dfsg.zip

We were able to reproduce the issue reliably on a Debian 13 system, the issue was not reproducible on a Windows 11 machine.

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Python
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