DEBIAN-CVE-2026-48683
FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read vulnerability in the NetFlow v9 data flowset processor. In src/netflow_plugin/netflow_v9_collector.cpp, the Data template branch (lines 1695-1702) iterates over flow records without performing a per-iteration bounds check against the packet end pointer. In contrast, the Options template branch (lines 1709-1719) correctly checks 'if (pkt + offset + field_template->total_length > packet_end)' before each iteration. The Data branch omits this check entirely. Since template definitions are sent by the network peer (and are unauthenticated UDP), an attacker can craft templates that cause the parser to read arbitrary memory past the packet buffer. This can leak sensitive memory contents or cause a crash.
DEBIAN-CVE-2026-48683
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-2026-48683
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/versions - Fixed versions
- 1.2.9-0+deb13u1
Source reference:
/affected/1/ranges - 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/versions - Fixed versions
- 1.2.9-1
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": "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-2026-48683.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.9-0+deb13u1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48683.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.9-1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48683.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57245 · Revision 1
- Added to Heist Feed
- Publisher date