CVE-2026-41643

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.

CVSS 3.1

7.5CVSS: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 45% of CVEs (scores of 2026-10-26)

CWE

CWE-129

Published

2026-05-07

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• osrg:gobgp

Packages (OSV)

References

• https://github.com/osrg/gobgp/releases/tag/v4.3.0
• https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q
• https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q

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