High
proftpd-dfsg — security advisory
ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.
- Products
- proftpd-dfsg
- Affected versions
- 1.3.5-2, 1.3.5a-1, 1.3.5a-1build1, 1.3.5a-1ubuntu0.1, 1.3.5d-1, 1.3.5e-1build1, 1.3.6-6build2, 1.3.6c-1, 1.3.6c-2, 1.3.6c-2ubuntu0.1, 1.3.7b+dfsg-1, 1.3.7c+dfsg-1build1, 1.3.7c+dfsg-1ubuntu0.1, 1.3.8+dfsg-8, 1.3.8.a+dfsg-1, 1.3.8.b+dfsg-1, 1.3.8.b+dfsg-1build1, 1.3.8.b+dfsg-1build2, 1.3.8.b+dfsg-1build3, 1.3.8.b+dfsg-1ubuntu0.1, 1.3.8.c+dfsg-2, 1.3.8.c+dfsg-4, 1.3.9b~dfsg-1, 1.3.9d~dfsg-1, 1.3.9~dfsg-3, 1.3.9~dfsg-4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-35025
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:02 UTC · Revision 1
Source evidence
ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.
osv:UBUNTU-CVE-2026-35025
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
proftpd-dfsg
Fixed versions: Not specified
Complete source record
{
"id": "e509700a432ac2f27aadf1fe1381cdd49e91c2c40c3d4de9c4e71aa2ad62488c",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-35025",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-35025",
"summary": "ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.",
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},
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},
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},
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},
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},
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},
{
"binary_name": "proftpd-mod-mysql",
"binary_version": "1.3.9d~dfsg-1"
},
{
"binary_name": "proftpd-mod-odbc",
"binary_version": "1.3.9d~dfsg-1"
},
{
"binary_name": "proftpd-mod-pgsql",
"binary_version": "1.3.9d~dfsg-1"
},
{
"binary_name": "proftpd-mod-snmp",
"binary_version": "1.3.9d~dfsg-1"
},
{
"binary_name": "proftpd-mod-sqlite",
"binary_version": "1.3.9d~dfsg-1"
},
{
"binary_name": "proftpd-mod-wrap",
"binary_version": "1.3.9d~dfsg-1"
}
]
}
},
{
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{
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{
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}
]
}
],
"package": {
"name": "proftpd-dfsg",
"purl": "pkg:deb/ubuntu/proftpd-dfsg?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.3.9~dfsg-3",
"1.3.9~dfsg-4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35025.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "proftpd-core",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-crypto",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-geoip",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-ldap",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-mysql",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-odbc",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-pgsql",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-snmp",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-sqlite",
"binary_version": "1.3.9~dfsg-4"
},
{
"binary_name": "proftpd-mod-wrap",
"binary_version": "1.3.9~dfsg-4"
}
]
}
}
],
"modified": "2026-10-17T13:00:02.871683773Z",
"provider": "osv",
"upstream": [
"CVE-2026-35025"
],
"references": [
"https://ubuntu.com/security/CVE-2026-35025",
"https://www.cve.org/CVERecord?id=CVE-2026-35025",
"https://github.com/proftpd/proftpd/issues/2170"
]
},
"related_cves": [
{
"value": "CVE-2026-35025",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360189,
"published_at": "2026-06-24T14:17:00+00:00"
}