CVE-2026-41642: Osrg Gobgp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Osrg Gobgp: version 4.3.0 only

Published 2026-05-07. Last modified 2026-06-17.