CVE-2026-42285Public exploitNetwork attack vector

Remote service crash via malformed BGP UPDATE

Published May 7, 2026 · Updated May 7, 2026

NULL pointer dereference in OSRG GoBGP 4.4.0 allows remote attackers to crash the routing daemon via a malformed BGP UPDATE. During treat-as-withdraw handling, AdjRib.Update dereferences a nil path or attribute structure left by failed attribute-length validation. An unauthenticated BGP peer with an established session can stop the entire process, interrupting routing service until it restarts.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in OSRG GoBGP 4.4.0 allows remote attackers to crash the routing daemon via a malformed BGP UPDATE. During treat-as-withdraw handling, AdjRib.Update dereferences a nil path or attribute structure left by failed attribute-length validation. An unauthenticated BGP peer with an established session can stop the entire process, interrupting routing service until it restarts.

The record

CVE
CVE-2026-42285
Published
May 7, 2026
Updated
May 7, 2026
Vendor
GoBGP
Product
GoBGP
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 4.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoBGP · GoBGPversion== 4.4.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

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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