CVE-2026-41642

HIGH

GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute

Title source: cna
STIX 2.1

Description

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as "Well-known," the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/osrg/gobgp/releases/tag/v4.4.0

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-476
Status published
Products (3)
osrg/gobgp 4.3.0
osrg/gobgp 4.3.0 - 4.4.0Go
osrg/gobgp = 4.3.0
Published May 07, 2026
Tracked Since May 07, 2026