High
Security advisory
This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. When extracted, the symbolic link is followed outside of the target dir allowing writing arbitrary files on the target host. In some cases, this can allow an attacker to execute arbitrary code. The vulnerable code is in the ZipFile::uncompressEntry function in juce_ZipFile.cpp and is executed when the archive is extracted upon calling uncompressTo() on a ZipFile object.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-23521
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:44 UTC · Revision 1
Source evidence
This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. When extracted, the symbolic link is followed outside of the target dir allowing writing arbitrary files on the target host. In some cases, this can allow an attacker to execute arbitrary code. The vulnerable code is in the ZipFile::uncompressEntry function in juce_ZipFile.cpp and is executed when the archive is extracted upon calling uncompressTo() on a ZipFile object.
osv:CVE-2021-23521
Complete source record
{
"id": "0ed6403f2fe002db9b61f7589793f3948bafdd71ec7cd10929cda04040589fb5",
"url": "https://osv.dev/vulnerability/CVE-2021-23521",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-23521",
"summary": "This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. When extracted, the symbolic link is followed outside of the target dir allowing writing arbitrary files on the target host. In some cases, this can allow an attacker to execute arbitrary code. The vulnerable code is in the ZipFile::uncompressEntry function in juce_ZipFile.cpp and is executed when the archive is extracted upon calling uncompressTo() on a ZipFile object.",
"evidence": "osv:CVE-2021-23521",
"products": [],
"severity": "high",
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"2.0.0",
"1.53",
"1.52",
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"database_specific": {
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"vanir_signatures": [
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"target": {
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"target": {
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"function": "TemporaryFile::deleteTemporaryFile"
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"vanir_signatures_modified": "2026-10-20T14:24:30Z"
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"modified": "2026-10-20T14:24:30.181983239Z",
"provider": "osv",
"references": [
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"source_id": "core-osv",
"document_id": 388921,
"published_at": "2022-01-31T11:15:07.933+00:00"
}