Remote Denial of Service Vulnerability in GoBGP by OSRG
CVE-2026-41642

7.5HIGH

Key Information:

Vendor

Osrg

Status
Gobgp
Vendor
CVE Published:
7 May 2026

What is CVE-2026-41642?

GoBGP, an open-source implementation of the Border Gateway Protocol in the Go programming language, has a vulnerability in version 4.3.0 that allows for a remote Denial of Service (DoS) attack. This vulnerability arises from a nil pointer dereference that occurs when the daemon processes a malformed BGP UPDATE message containing an unrecognized well-known Path Attribute. This flaw leads to an illegal memory access, causing the GoBGP process to crash, disrupting normal operations. To mitigate this risk, users are urged to upgrade to version 4.4.0, which resolves the issue.

Affected Version(s)

gobgp = 4.3.0

References

https://github.com/osrg/gobgp/security/advisories/GHSA-72...
x_refsource_CONFIRM
https://github.com/osrg/gobgp/releases/tag/v4.4.0
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.