CVE-2026-41643
HighSummary
GoBGP, an open source implementation of the BGP protocol in Go, prior to version 4.3.0 has a remote Denial of Service (DoS) vulnerability. A malformed BGP UPDATE message can trigger a runtime error related to an index out of range.
Risk Assessment
Organizations using GoBGP may be vulnerable to DoS attacks, potentially leading to service unavailability.
Recommendation
It is recommended to upgrade GoBGP to version 4.3.0 or later to mitigate this vulnerability.
Other vulnerabilities in GoBGP
See all- CVE-2026-42285High
In version 4.4.0 of GoBGP, an unauthenticated remote BGP peer can trigger a fatal panic by sending a specially crafted BGP UPDATE message. This bug causes the entire GoBGP process to crash, resulting in a complete loss of service availability.
- CVE-2026-41642High
In version 4.3.0 of GoBGP, an open source BGP implementation, a remote Denial of Service (DoS) vulnerability exists due to a nil pointer dereference. A malformed BGP UPDATE message containing an unrecognized Path Attribute marked as 'Well-known' leads to a process crash.
- CVE-2026-37461High
An out-of-bounds read in the ParseIP6Extended function in gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) by supplying a crafted BGP UPDATE message.
- CVE-2026-37462High
An integer underflow in the BGPUpdate.DecodeFromBytes function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a denial of service by sending a crafted BGP UPDATE message.
Original NVD description (English source)
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.