CVE-2026-30405: GoBGP vulnerable to a denial of service via the NEXT_HOP path attribute

CVE-2026-30405 · Severity: high · CVSS 7.5 · Published 2026-03-16

An issue in GoBGP gobgpd v.4.2.0 allows a remote attacker to cause a denial of service via the NEXT_HOP path attribute.

Technologies: github.com/osrg/gobgp (Go), github.com/osrg/gobgp/v3 (Go), github.com/osrg/gobgp/v4 (Go). Vendors: Go.

Quick answers

Is CVE-2026-30405 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-30405 being exploited in the wild.
How severe is CVE-2026-30405?
High severity, with a CVSS score of 7.5, published 16 March 2026.
Which products and versions are affected?
github.com/osrg/gobgp (Go) SEMVER:introduced=0; github.com/osrg/gobgp/v3 (Go) SEMVER:introduced=0; github.com/osrg/gobgp/v4 (Go) <= 4.3.0, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=4.3.0.
Is there a fix for CVE-2026-30405?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-30405?
Check whether you run github.com/osrg/gobgp (Go), github.com/osrg/gobgp/v3 (Go) or github.com/osrg/gobgp/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • github.com/osrg/gobgp (Go) SEMVER:introduced=0
  • github.com/osrg/gobgp/v3 (Go) SEMVER:introduced=0
  • github.com/osrg/gobgp/v4 (Go) <= 4.3.0, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=4.3.0

Identifiers

  • CVE-2026-30405
  • GHSA-4p9m-8gc4-rw2h
  • GO-2026-4736

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.