CVE-2026-41642 — HIGH (7.5)

Vulnerability 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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Osrg	Gobgp	4.3.0

Related Weaknesses (CWE)

CWE-476

References

https://github.com/osrg/gobgp/releases/tag/v4.4.0PatchProduct
https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4pxExploitVendor Advisory
https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4pxExploitVendor Advisory

FAQ

What is CVE-2026-41642?

CVE-2026-41642 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 point...

How severe is CVE-2026-41642?

CVE-2026-41642 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-41642?

Check the references section above for vendor advisories and patch information. Affected products include: Osrg Gobgp.