DEBIAN-CVE-2026-48682
FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.
DEBIAN-CVE-2026-48682
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-2026-48682
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-2026-48682.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"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-2026-48682.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"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-2026-48682.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57717 · Revision 1
- Added to Heist Feed
- Publisher date