CVE-2026-41643: GoBGP Remote DoS Vulnerability Exposes Network Infrastructure
The National Vulnerability Database has identified CVE-2026-41643, a critical Denial of Service (DoS) vulnerability in GoBGP, an open-source BGP implementation. Versions prior to 4.3.0 are susceptible to a remote DoS attack where a malformed BGP UPDATE message, specifically one manipulating 4-byte AS attributes, can trigger a runtime panic due to an unhandled index out of range error. This flaw has a CVSS score of 7.5, rated as HIGH.
This vulnerability directly impacts the stability and availability of network routing infrastructure that relies on GoBGP. Attackers can exploit this by sending crafted network traffic, potentially disrupting internet connectivity and critical business operations. Given the widespread use of BGP for inter-network communication, the implications are significant for organizations managing their own network edge or cloud environments utilizing BGP.
Defenders must prioritize upgrading GoBGP to version 4.3.0 or later to mitigate this risk. Network security teams should also consider implementing stricter ingress filtering on BGP update messages where possible, although patching remains the most effective defense against this specific flaw. Monitoring BGP traffic for anomalous update messages could provide early warning, but the primary action is immediate patching.
What This Means For You
- If your organization uses GoBGP for network routing, you must patch to version 4.3.0 immediately. Failure to do so leaves your network vulnerable to remote DoS attacks that could disrupt critical routing functions and cause widespread outages.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
DoS Traffic Pattern Detection
title: DoS Traffic Pattern Detection
id: scw-2026-05-07-1
status: experimental
level: high
description: |
Detects volumetric traffic patterns consistent with denial of service attacks targeting your infrastructure.
author: SCW Feed Engine (auto-generated)
date: 2026-05-07
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41643/
tags:
- attack.impact
- attack.t1499
logsource:
category: firewall
detection:
selection:
dst_port:
- 80
- 443
condition: selection | count(src_ip) by dst_ip > 1000
falsepositives:
- Legitimate activity from CVE-2026-41643
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41643 | Vulnerability | CVE-2026-41643 |
| CVE-2026-41643 | Affected Product | the Go Programming Language. |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 07, 2026 at 15:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
Believe this infringes your rights? Submit a takedown request.
Related coverage
DivvyDrive XSS Vulnerability (CVE-2026-6002) Poses High Risk
CVE-2026-6002 — Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in DivvyDrive Information Technologies Inc. DivvyDrive allows Cross-Site Scripting (XSS)....
DivvyDrive Critical CSRF Vulnerability: CVE-2026-5791 Poses Remote Attack Risk
CVE-2026-5791 — Cross-Site request forgery (CSRF) vulnerability in DivvyDrive Information Technologies Inc. DivvyDrive allows Cross Site Request Forgery. This issue affects DivvyDrive: from 4.8.2.9 before...
DivvyDrive Stored XSS Vulnerability (CVE-2026-5784) Poses High Risk
CVE-2026-5784 — Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in DivvyDrive Information Technologies Inc. DivvyDrive allows Stored XSS. This issue affects...