CVE-2026-41643: 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. 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.

Affected products

• Osrg Gobgp: before 4.3.0 (fixed in 4.3.0)

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