CVE-2026-41643

HIGH

GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/osrg/gobgp/releases/tag/v4.3.0

Scores

CVSS v3 7.5
EPSS 0.0050
EPSS Percentile 38.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-129
Status published
Products (2)
osrg/gobgp < 4.3.0 (2 CPE variants)
osrg/gobgp 0 - 4.3.0Go
Published May 07, 2026
Tracked Since May 07, 2026