What is CVE-2026-41643?

CVE-2026-41643 is a high-severity vulnerability in Osrg Gobgp, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-05-07.

How severe is CVE-2026-41643?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Osrg Gobgp

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…

EPSS: 0.000 (15.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Osrg Gobgp — versions < 4.3.0

Weakness classification (CWE)

CWE-129 — Improper Validation of Array Index

References

https://github.com/osrg/gobgp/releases/tag/v4.3.0 (Patch, x_refsource_MISC, Release Notes)
https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41643?: CVE-2026-41643 is a high-severity vulnerability in Osrg Gobgp, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-05-07.
How severe is CVE-2026-41643?: High severity. CVSS v3 base score is 7.5 out of 10.