CVE-2026-37458Network attack vector

BGP daemon crash via martian next hop

Published May 4, 2026 · Updated May 4, 2026

Improper input validation in FRRouting 10.0 through 10.6.0 allows remote authenticated users to crash bgpd via a crafted BGP UPDATE. The bgp_mp_reach_parse function accepts an IPv4 martian next hop in an MP_REACH_NLRI attribute instead of treating the route as withdrawn. The attacker must be an authenticated BGP peer able to supply the attribute; the consequence is routing-service interruption.

CVSS severity6.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in FRRouting 10.0 through 10.6.0 allows remote authenticated users to crash bgpd via a crafted BGP UPDATE. The bgp_mp_reach_parse function accepts an IPv4 martian next hop in an MP_REACH_NLRI attribute instead of treating the route as withdrawn. The attacker must be an authenticated BGP peer able to supply the attribute; the consequence is routing-service interruption.

The record

CVE
CVE-2026-37458
Published
May 4, 2026
Updated
May 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

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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