CVE-2026-48696

Local service crash via unbounded ExaBGP formatting

Published May 26, 2026 · Updated May 26, 2026

Buffer overflow in FastNetMon Community Edition through 1.2.9 allows local users to crash the daemon through a crafted ExaBGP community list. exabgp_prefix_ban_manage() uses sprintf() to place the unbounded exabgp_community value in a 256-byte stack buffer. Triggering requires control of fastnetmon.conf and a subsequent ExaBGP mitigation action; the grounded impact is limited to a daemon crash.

CVSS severity6.2
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in FastNetMon Community Edition through 1.2.9 allows local users to crash the daemon through a crafted ExaBGP community list. exabgp_prefix_ban_manage() uses sprintf() to place the unbounded exabgp_community value in a 256-byte stack buffer. Triggering requires control of fastnetmon.conf and a subsequent ExaBGP mitigation action; the grounded impact is limited to a daemon crash.

The record

CVE
CVE-2026-48696
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-676, CWE-120, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.2NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-676Use of Potentially Dangerous Function
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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