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Vulnerabilities / CVE-2026-48689

critical

CVE-2026-48689

FastNetMon Community Edition through 1.2.9 contains an off-by-one heap ...

Published Modified CWE 787, 122, 193
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium).

Description

FastNetMon Community Edition through 1.2.9 contains an off-by-one heap-based buffer overflow in the dynamic_binary_buffer_t class (src/dynamic_binary_buffer.hpp). Five methods (append_dynamic_buffer, append_data_as_pointer, append_data_as_object_ptr, memcpy_from_ptr, memcpy_from_object_ptr) use an incorrect bounds check of the form 'if (offset + length > maximum_internal_storage_size + 1)' instead of the correct 'if (offset + length > maximum_internal_storage_size)'. This allows writing exactly one byte past the end of the heap-allocated buffer. The class is used pervasively in BGP message encoding/decoding, NetFlow template processing, and Flow Spec NLRI construction. An attacker who can send network traffic (NetFlow, sFlow, IPFIX, or BGP) to a FastNetMon instance can trigger this overflow, potentially achieving arbitrary code execution by corrupting heap metadata. Notably, the append_byte() method uses the correct bounds check, confirming the inconsistency.

Affected packages and fixed versions

SourcePackageFixed in
debian 13fastnetmon1.2.9-0+deb13u1
debian 14fastnetmon1.2.9-1
rapidfort debian 12fastnetmon0:1.2.9-0+deb13u1, 0:1.2.9-1
rapidfort debian 13fastnetmon0:1.2.9-0+deb13u1, 0:1.2.9-1
rapidfort fedora 43fastnetmon1.2.9-2.fc43
rapidfort Oracle Linux 10fastnetmonno fix listed
rapidfort Oracle Linux 9fastnetmonno fix listed
rapidfort ubuntu 20.04fastnetmonno fix listed
rapidfort ubuntu 22.04fastnetmonno fix listed
rapidfort ubuntu 24.04fastnetmonno fix listed
ubuntu 24.04fastnetmonno fix listed
ubuntu 26.04fastnetmonno fix listed

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.