Security advisory
ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. Clients of FTP servers utilizing ftp-srv hosted on Windows machines can escape the FTP user's defined root folder using the expected FTP commands, for example, CWD and UPDR. When windows separators exist within the path (`\`), `path.resolve` leaves the upper pointers intact and allows the user to move beyond the root folder defined for that user. We did not take that into account when creating the path resolve function. The issue is patched in version 4.4.0 (commit 457b859450a37cba10ff3c431eb4aa67771122e3).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-26299
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:08 UTC · Revision 1
Source evidence
ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. Clients of FTP servers utilizing ftp-srv hosted on Windows machines can escape the FTP user's defined root folder using the expected FTP commands, for example, CWD and UPDR. When windows separators exist within the path (`\`), `path.resolve` leaves the upper pointers intact and allows the user to move beyond the root folder defined for that user. We did not take that into account when creating the path resolve function. The issue is patched in version 4.4.0 (commit 457b859450a37cba10ff3c431eb4aa67771122e3).
osv:CVE-2020-26299
Complete source record
{
"id": "40df6f964ee7fd3731290d12075a08c2790a673433fbda4719f253836435808b",
"url": "https://osv.dev/vulnerability/CVE-2020-26299",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-26299",
"summary": "ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. Clients of FTP servers utilizing ftp-srv hosted on Windows machines can escape the FTP user's defined root folder using the expected FTP commands, for example, CWD and UPDR. When windows separators exist within the path (`\\`), `path.resolve` leaves the upper pointers intact and allows the user to move beyond the root folder defined for that user. We did not take that into account when creating the path resolve function. The issue is patched in version 4.4.0 (commit 457b859450a37cba10ff3c431eb4aa67771122e3).",
"evidence": "osv:CVE-2020-26299",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2020-26299",
"aliases": [
"CVE-2020-26299",
"GHSA-pmw4-jgxx-pcq9"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/QuorumDMS/ftp-srv",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "78de22f518a76bd06b9a564f5b6eaf13047d4e95"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:ftp-srv_project:ftp-srv:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.4.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26299.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/quorumdms/ftp-srv",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "457b859450a37cba10ff3c431eb4aa67771122e3"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"fixed": "457b859450a37cba10ff3c431eb4aa67771122e3"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26299.json"
}
}
],
"modified": "2026-10-20T10:52:57.338401660Z",
"provider": "osv",
"references": [
"https://www.npmjs.com/package/ftp-srv",
"https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3",
"https://github.com/autovance/ftp-srv/issues/167",
"https://github.com/autovance/ftp-srv/pull/224",
"https://github.com/autovance/ftp-srv/issues/225",
"https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-26299",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 384088,
"published_at": "2021-02-10T18:15:12.703+00:00"
}