CVE-2026-41642
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductOsrg Gobgp
PublishedMay 7, 2026
First seenMay 7, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- github.com/osrg/gobgp/v44.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| osrg gobgp | 4.3.0 | — |
| github.com/osrg/gobgp/v4Go | 4.3.0 ≤ v < 4.4.0 | 4.4.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.