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Description

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.

PUBLISHED Reserved 2026-04-21 | Published 2026-05-07 | Updated 2026-05-07 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-129: Improper Validation of Array Index

Product status

< 4.3.0
affected

References

github.com/.../gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q exploit

github.com/.../gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q

github.com/osrg/gobgp/releases/tag/v4.3.0

cve.org (CVE-2026-41643)

nvd.nist.gov (CVE-2026-41643)

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