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.
Published: 2026-05-07
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-8rxh-r2p6-7f2q GoBGP has Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
History

Thu, 07 May 2026 19:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:*

Thu, 07 May 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Osrg
Osrg gobgp
Vendors & Products Osrg
Osrg gobgp

Thu, 07 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 07 May 2026 12:15:00 +0000

Type Values Removed Values 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.
Title GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
Weaknesses CWE-129
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-07T13:39:04.425Z

Reserved: 2026-04-21T23:58:43.802Z

Link: CVE-2026-41643

cve-icon Vulnrichment

Updated: 2026-05-07T13:38:03.249Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-07T12:16:17.623

Modified: 2026-05-07T19:43:46.187

Link: CVE-2026-41643

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-07T15:00:13Z

Weaknesses