CVE catalog

CVE-2026-48684

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.c

[CVE catalog]

Severity
Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Published
Source
[NVD] · [CVE record]
EPSS
0.26% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianfastnetmonsid1.2.9-1fixed
Debianfastnetmonforky1.2.9-1fixed
Debianfastnetmontrixie1.2.9-0+deb13u1fixed
Debianfastnetmontrixie-security1.2.9-0+deb13u1fixed
Debianfastnetmonbookworm1.2.4-2+deb12u1vulnerable
Debianfastnetmonbookworm-security1.2.4-2+deb12u1vulnerable
CpefastnetmonNot reportedNot reportedvulnerable
CpefastnetmonNot reportedNot reportedunknown

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianfastnetmonsourcesid1.2.9-1unimportantNot reported[1138646]
Debianfastnetmonsourceforky1.2.9-1unimportantNot reported[1138646]
Debianfastnetmonsourcetrixie1.2.9-0+deb13u1not yet assignedNot reported[1138646]
Debianfastnetmonsourcebookworm(unfixed)unimportantNot reported[1138646]

[Debian bug #1138646]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [fastnetmon]Affected
    Details (6)

    • 1.2.4-2+deb12u1 · amd64 · bookworm

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

    • 1.2.4-2+deb12u1 · arm64 · bookworm

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

    • 1.2.8-1~bpo12+1 · amd64 · bookworm-backports

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

    • 1.2.8-1~bpo12+1 · arm64 · bookworm-backports

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

    • 1.2.4-2+deb12u1 · amd64 · bookworm-security

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

    • 1.2.4-2+deb12u1 · arm64 · bookworm-security

      Affected

      nvd · fastnetmon · debian · bookworm; nvd · fastnetmon · debian · 12

[Debian 13 (Trixie)]

  • [fastnetmon]Fixed
    Details (4)

    • 1.2.9-0+deb13u1 · amd64 · trixie

      Fixed · Fixed: 1.2.9-0+deb13u1

      nvd · fastnetmon · debian · 13

    • 1.2.9-0+deb13u1 · arm64 · trixie

      Fixed · Fixed: 1.2.9-0+deb13u1

      nvd · fastnetmon · debian · 13

    • 1.2.9-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.2.9-0+deb13u1

      nvd · fastnetmon · debian · 13

    • 1.2.9-0+deb13u1 · arm64 · trixie-security

      Fixed · Fixed: 1.2.9-0+deb13u1

      nvd · fastnetmon · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]