CVE-2026-41642
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.
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-26)
- CWE
- CWE-476
- Published
- Modified
- Record from
- the NVD, synced
Affected
- osrg:gobgp
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-7235-89m6-f4px | Go | github.com/osrg/gobgp/v4 | >=4.3.0 <4.4.0 | 4.4.0 |
| GO-2026-5198 | Go | github.com/osrg/gobgp/v4 | >=4.3.0 <4.4.0 | 4.4.0 |