CVE-2026-41643

Publication date 7 May 2026

Last updated 6 June 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gobgp	26.04 LTS resolute	Fixed 3.36.0-2ubuntu0.1~esm1
	25.10 questing	Vulnerable
	24.04 LTS noble	Fixed 3.23.0-1ubuntu0.3+esm4
	22.04 LTS jammy	Fixed 2.25.0-3ubuntu0.1+esm4
	20.04 LTS focal	Fixed 2.12.0-1ubuntu0.1~esm3
	18.04 LTS bionic	Fixed 1.29-1ubuntu0.1+esm2

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gobgp	Upstream: 9fe96a9

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-8348-1
GoBGP vulnerabilities
3 June 2026