DEBIAN-CVE-2026-48693
FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp. The statistics file path defaults to '/tmp/fastnetmon.dat' (src/fastnetmon.cpp line 159). The print_screen_contents_into_file() function (src/fastnetmon_logic.cpp line 2186) opens this path with std::ios::trunc without checking for symlinks or using O_NOFOLLOW. Additionally, the chmod() call on line 2190 always operates on cli_stats_file_path regardless of which file_path parameter was passed (a bug that applies wrong permissions), and the umask is set to 0 during daemonization (src/fastnetmon.cpp line 1821), making all created files world-writable. A local attacker can exploit this to overwrite arbitrary files as the FastNetMon process user (typically root).
DEBIAN-CVE-2026-48693
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-2026-48693
fastnetmon
Source reference: /affected/0/package/name
- Affected versions
- 1.2.4-2
Source reference:
/affected/0/versions1.2.4-2+deb12u1Source reference:
/affected/0/versions1.2.5-1Source reference:
/affected/0/versions1.2.5-2Source reference:
/affected/0/versions1.2.5-2~bpo12+1Source reference:
/affected/0/versions1.2.6-1Source reference:
/affected/0/versions1.2.6-1~bpo12+1Source reference:
/affected/0/versions1.2.7-1Source reference:
/affected/0/versions1.2.7-1~bpo12+1Source reference:
/affected/0/versions1.2.8+git20250911-1Source reference:
/affected/0/versions1.2.8+git20250911-2Source reference:
/affected/0/versions1.2.8-1Source reference:
/affected/0/versions1.2.8-1~bpo12+1Source reference:
/affected/0/versions1.2.9-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
fastnetmon
Source reference: /affected/1/package/name
- Affected versions
- 1.2.8+git20250911-1
Source reference:
/affected/1/versions1.2.8+git20250911-2Source reference:
/affected/1/versions1.2.8-1Source reference:
/affected/1/versions1.2.9-0+deb13u1Source reference:
/affected/1/versions1.2.9-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
fastnetmon
Source reference: /affected/2/package/name
- Affected versions
- 1.2.8+git20250911-1
Source reference:
/affected/2/versions1.2.8+git20250911-2Source reference:
/affected/2/versions1.2.8-1Source reference:
/affected/2/versions1.2.9-1Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- 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": "fastnetmon",
"purl": "pkg:deb/debian/fastnetmon?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.2.4-2",
"1.2.4-2+deb12u1",
"1.2.5-1",
"1.2.5-2",
"1.2.5-2~bpo12+1",
"1.2.6-1",
"1.2.6-1~bpo12+1",
"1.2.7-1",
"1.2.7-1~bpo12+1",
"1.2.8+git20250911-1",
"1.2.8+git20250911-2",
"1.2.8-1",
"1.2.8-1~bpo12+1",
"1.2.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48693.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fastnetmon",
"purl": "pkg:deb/debian/fastnetmon?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.2.8+git20250911-1",
"1.2.8+git20250911-2",
"1.2.8-1",
"1.2.9-0+deb13u1",
"1.2.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48693.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fastnetmon",
"purl": "pkg:deb/debian/fastnetmon?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.2.8+git20250911-1",
"1.2.8+git20250911-2",
"1.2.8-1",
"1.2.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48693.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57241 · Revision 1
- Added to Heist Feed
- Publisher date