---
id: CVE-2026-37461
aliases:
  - GHSA-wmvj-f67g-qg4g
  - GO-2026-5713
title: GoBGP has an out-of-bounds read in the ParseIP6Extended function
summary: GoBGP has an out-of-bounds read in the ParseIP6Extended function
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: osrg
product: github.com/osrg/gobgp/v4
ecosystem: go
affected:
  - github.com/osrg/gobgp/v4 < 4.4.0
patched:
  - github.com/osrg/gobgp/v4 4.4.0
published: '2026-05-04'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-wmvj-f67g-qg4g'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-37461'
  - url: >-
      https://github.com/osrg/gobgp/commit/362cce3e325f56e7a4f792ccb9689b3bdda9e682
  - url: >-
      https://github.com/osrg/gobgp/commit/9ce8936672ebc07df524da77fa4c6ae26d92be6d
  - url: 'https://github.com/osrg/gobgp'
  - url: 'https://github.com/osrg/gobgp/blob/v4.3.0/pkg/packet/bgp/bgp.go'
tags:
  - osv
  - go
epss: 0.00609
epssPercentile: 0.46843
ingestedAt: '2026-07-09T18:56:36.968Z'
---

## Overview

An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

## Affected packages

- `github.com/osrg/gobgp/v4 < 4.4.0`

## Remediation

Upgrade to a patched release:

- `github.com/osrg/gobgp/v4 4.4.0`