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DEBIAN-CVE-2026-48688

Type: advisorySource: OSV1 source record

FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6 attribute decoder. The function decode_mp_reach_ipv6() in src/bgp_protocol.cpp contains a TODO comment at line 156 explicitly acknowledging 'we should add sanity checks to avoid reads after attribute memory block.' The function casts raw pointers to structure types without verifying sufficient data exists (line 158), uses the attacker-controlled length_of_next_hop field to determine memcpy size (line 181), and computes prefix_length by dereferencing a pointer calculated from multiple attacker-controlled offsets without bounds validation (line 189). The prefix_length is then used to calculate number_of_bytes_required_for_prefix which becomes a memcpy length (line 202) with no check against remaining buffer size.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-48688

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-2026-48688

fastnetmon

Source reference: /affected/0/package/name

Affected 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

Fixed versions
1.2.9-0+deb13u1

Source reference: /affected/0/ranges

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
1.2.9-1

Source reference: /affected/1/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"
          },
          {
            "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-2026-48688.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-2026-48688.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57223 · Revision 1
Added to Heist Feed
Publisher date
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