CVE-2026-41643

Name: CVE-2026-41643
Creator: NVD / NIST
Published: 2026-05-07T12:16:17.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2026-41643 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.50%

39.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-129

Affected Software

Vendor	Product	Versions
Osrg	Gobgp	< 4.3.0

References

https://github.com/osrg/gobgp/releases/tag/v4.3.0Patch, Release Notes
https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2qExploit, Vendor Advisory
https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2qExploit, Vendor Advisory

Timeline

Published: May 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41643?

How severe is CVE-2026-41643?

CVE-2026-41643 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2026-41643?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41643?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST