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DEBIAN-CVE-2026-48684

Type: advisorySource: OSV1 source record

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template parser. In process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), the scope parsing loop (lines 224-229) iterates until scopes_offset reaches the attacker-controlled option_scope_length value, reading netflow9_template_flowset_record_t structures at each step. No bounds check validates that (zone_address + scopes_offset + sizeof(record)) stays within the flowset. The same issue affects the options field loop (lines 241-257) with option_length. Furthermore, option_scope_length is not validated to be a multiple of sizeof(netflow9_template_flowset_record_t), potentially causing misaligned reads. An attacker can trigger reads past the end of the UDP packet buffer.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-48684

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-2026-48684

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-2026-48684.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-2026-48684.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-2026-48684.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57227 · Revision 1
Added to Heist Feed
Publisher date
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