CVE-2026-41643
GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
Description
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.
INFO
Published Date :
May 7, 2026, 12:16 p.m.
Last Modified :
May 7, 2026, 7:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update GoBGP to version 4.3.0.
- Apply security patches for GoBGP.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41643.
| URL | Resource |
|---|---|
| https://github.com/osrg/gobgp/releases/tag/v4.3.0 | Patch Release Notes |
| https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q | Exploit Vendor Advisory |
| https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41643 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41643
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41643 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41643 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:* versions up to (excluding) 4.3.0 Added Reference Type GitHub, Inc.: https://github.com/osrg/gobgp/releases/tag/v4.3.0 Types: Patch, Release Notes Added Reference Type CISA-ADP: https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 07, 2026
Action Type Old Value New Value Added Reference https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-129 Added Reference https://github.com/osrg/gobgp/releases/tag/v4.3.0 Added Reference https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q