DEBIAN-CVE-2026-48688

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Source

https://security-tracker.debian.org/tracker/CVE-2026-48688

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48688.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48688

Upstream

CVE-2026-48688

Published

2026-05-26T16:16:26Z

Modified

2026-09-14T17:03:16Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

[none]

Details

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.

References

https://security-tracker.debian.org/tracker/CVE-2026-48688

Affected packages

Debian:13 / fastnetmon

Package

Name: fastnetmon
Purl: pkg:deb/debian/fastnetmon?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.2.9-0+deb13u1

Affected versions

1.*

1.2.8-1

1.2.8+git20250911-1

1.2.8+git20250911-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48688.json"

Debian:14 / fastnetmon