Vulnerability · Published May 7, 2026 · Assigned by GitHub_M
CVE-2026-41642GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
High 7.5
In plain English
A high-severity null pointer dereference in gobgp from osrg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | gobgp | 4.4.0-1 | DEBIAN-CVE-2026-41642 |
| Go | github.com/osrg/gobgp/v4 | 4.4.0 | GO-2026-5198 |
| Go | github.com/osrg/gobgp/v4 | 4.4.0 | GHSA-7235-89m6-f4px |
| Ubuntu:25.10 | gobgp | no fix listed | UBUNTU-CVE-2026-41642 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px x_refsource_CONFIRM
- https://github.com/osrg/gobgp/releases/tag/v4.4.0 x_refsource_MISC