DEBIAN-CVE-2026-63090
ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.
DEBIAN-CVE-2026-63090
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-63090
proftpd-dfsg
Source reference: /affected/0/package/name
- Affected versions
- 1.3.8+dfsg-4
Source reference:
/affected/0/versions1.3.8+dfsg-4+deb12u1Source reference:
/affected/0/versions1.3.8+dfsg-4+deb12u2Source reference:
/affected/0/versions1.3.8+dfsg-4+deb12u3Source reference:
/affected/0/versions1.3.8+dfsg-4+deb12u4Source reference:
/affected/0/versions1.3.8+dfsg-4+deb12u5Source reference:
/affected/0/versions1.3.8+dfsg-5Source reference:
/affected/0/versions1.3.8+dfsg-6Source reference:
/affected/0/versions1.3.8+dfsg-7Source reference:
/affected/0/versions1.3.8+dfsg-8Source reference:
/affected/0/versions1.3.8.a+dfsg-1Source reference:
/affected/0/versions1.3.8.b+dfsg-1Source reference:
/affected/0/versions1.3.8.b+dfsg-2Source reference:
/affected/0/versions1.3.8.b+dfsg-3Source reference:
/affected/0/versions1.3.8.b+dfsg-4Source reference:
/affected/0/versions1.3.8.c+dfsg-1Source reference:
/affected/0/versions1.3.8.c+dfsg-2Source reference:
/affected/0/versions1.3.8.c+dfsg-3Source reference:
/affected/0/versions1.3.8.c+dfsg-4Source reference:
/affected/0/versions1.3.9a~dfsg-1Source reference:
/affected/0/versions1.3.9b~dfsg-1Source reference:
/affected/0/versions1.3.9c~dfsg-1Source reference:
/affected/0/versions1.3.9d~dfsg-1Source reference:
/affected/0/versions1.3.9~dfsg-1Source reference:
/affected/0/versions1.3.9~dfsg-2Source reference:
/affected/0/versions1.3.9~dfsg-3Source reference:
/affected/0/versions1.3.9~dfsg-4Source reference:
/affected/0/versions1.3.9~dfsg-5Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
proftpd-dfsg
Source reference: /affected/1/package/name
- Affected versions
- 1.3.8.c+dfsg-4
Source reference:
/affected/1/versions1.3.8.c+dfsg-4+deb13u1Source reference:
/affected/1/versions1.3.8.c+dfsg-4+deb13u2Source reference:
/affected/1/versions - Fixed versions
- 1.3.8.c+dfsg-4+deb13u3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
proftpd-dfsg
Source reference: /affected/2/package/name
- Affected versions
- 1.3.8.c+dfsg-4
Source reference:
/affected/2/versions1.3.9a~dfsg-1Source reference:
/affected/2/versions1.3.9b~dfsg-1Source reference:
/affected/2/versions1.3.9~dfsg-1Source reference:
/affected/2/versions1.3.9~dfsg-2Source reference:
/affected/2/versions1.3.9~dfsg-3Source reference:
/affected/2/versions1.3.9~dfsg-4Source reference:
/affected/2/versions1.3.9~dfsg-5Source reference:
/affected/2/versions - Fixed versions
- 1.3.9c~dfsg-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "proftpd-dfsg",
"purl": "pkg:deb/debian/proftpd-dfsg?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.3.8+dfsg-4",
"1.3.8+dfsg-4+deb12u1",
"1.3.8+dfsg-4+deb12u2",
"1.3.8+dfsg-4+deb12u3",
"1.3.8+dfsg-4+deb12u4",
"1.3.8+dfsg-4+deb12u5",
"1.3.8+dfsg-5",
"1.3.8+dfsg-6",
"1.3.8+dfsg-7",
"1.3.8+dfsg-8",
"1.3.8.a+dfsg-1",
"1.3.8.b+dfsg-1",
"1.3.8.b+dfsg-2",
"1.3.8.b+dfsg-3",
"1.3.8.b+dfsg-4",
"1.3.8.c+dfsg-1",
"1.3.8.c+dfsg-2",
"1.3.8.c+dfsg-3",
"1.3.8.c+dfsg-4",
"1.3.9a~dfsg-1",
"1.3.9b~dfsg-1",
"1.3.9c~dfsg-1",
"1.3.9d~dfsg-1",
"1.3.9~dfsg-1",
"1.3.9~dfsg-2",
"1.3.9~dfsg-3",
"1.3.9~dfsg-4",
"1.3.9~dfsg-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63090.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.8.c+dfsg-4+deb13u3"
}
]
}
],
"package": {
"name": "proftpd-dfsg",
"purl": "pkg:deb/debian/proftpd-dfsg?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.3.8.c+dfsg-4",
"1.3.8.c+dfsg-4+deb13u1",
"1.3.8.c+dfsg-4+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63090.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.9c~dfsg-1"
}
]
}
],
"package": {
"name": "proftpd-dfsg",
"purl": "pkg:deb/debian/proftpd-dfsg?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.3.8.c+dfsg-4",
"1.3.9a~dfsg-1",
"1.3.9b~dfsg-1",
"1.3.9~dfsg-1",
"1.3.9~dfsg-2",
"1.3.9~dfsg-3",
"1.3.9~dfsg-4",
"1.3.9~dfsg-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63090.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57367 · Revision 1
- Added to Heist Feed
- Publisher date