PatchTheCVECVE-2026-48684: FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template p
CVE-2026-48684 is a medium-severity flaw (CVSS 6.5) affecting fastnetmon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 + sco
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 82%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-05-26 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-48684?
fastnetmon: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.
Is CVE-2026-48684 being exploited?
CVE-2026-48684 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-48684 affect?
CVE-2026-48684 affects fastnetmon. Severity is medium (CVSS 6.5). 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 224-2
How urgent is CVE-2026-48684?
Priority 32/100. Remotely exploitable, no login, no user action
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