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DEBIAN-CVE-2026-48683

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

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/versions

1.2.4-2+deb12u1

Source reference: /affected/0/versions

1.2.5-1

Source reference: /affected/0/versions

1.2.5-2

Source reference: /affected/0/versions

1.2.5-2~bpo12+1

Source reference: /affected/0/versions

1.2.6-1

Source reference: /affected/0/versions

1.2.6-1~bpo12+1

Source reference: /affected/0/versions

1.2.7-1

Source reference: /affected/0/versions

1.2.7-1~bpo12+1

Source reference: /affected/0/versions

1.2.8+git20250911-1

Source reference: /affected/0/versions

1.2.8+git20250911-2

Source reference: /affected/0/versions

1.2.8-1

Source reference: /affected/0/versions

1.2.8-1~bpo12+1

Source reference: /affected/0/versions

1.2.9-1

Source 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/versions

1.2.8+git20250911-2

Source reference: /affected/1/versions

1.2.8-1

Source 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/versions

1.2.8+git20250911-2

Source reference: /affected/2/versions

1.2.8-1

Source 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
Read the original announcement