CVE-2026-41642

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

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

osrg · gobgp

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.60% chance of exploitation in the next 30 days, 48th percentile

Published

2026-05-07

Proof-of-concept exploits (1)

• advisories/GHSA-7235-89m6-f4px

Security advisories

• osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px
• osrg/gobgp/releases/tag/v4.4.0

References

• CVE Record
• NVD entry