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

Source: https://junglewise.ai/threats/cve-2026-30405-gobgp-vulnerable-to-a-denial-of-service-via-the-next-hop-path  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-16  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-osrg-gobgp), [github.com/osrg/gobgp/v3 (Go)](https://junglewise.ai/threats/technologies/github-com-osrg-gobgp-v3), [github.com/osrg/gobgp/v4 (Go)](https://junglewise.ai/threats/technologies/github-com-osrg-gobgp-v4). Vendors: [Go](https://junglewise.ai/threats/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

## Related threats

- [osrg GoBGP denial of service via empty AS_PATH attribute](https://junglewise.ai/threats/cve-2026-49838-osrg-gobgp-denial-of-service-via-empty-as-path-attribute)
- [GoBGP out-of-bounds read in BGP OPEN capability parser](https://junglewise.ai/threats/cve-2026-49837-gobgp-out-of-bounds-read-in-bgp-open-capability-parser)
- [GoBGP integer underflow in BGPUpdate.DecodeFromBytes](https://junglewise.ai/threats/cve-2026-37462-gobgp-integer-underflow-in-bgpupdate-decodefrombytes)
- [osrg GoBGP nil pointer dereference in AdjRib.Update](https://junglewise.ai/threats/cve-2026-42285-osrg-gobgp-nil-pointer-dereference-in-adjrib-update)
- [GoBGP has Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE](https://junglewise.ai/threats/cve-2026-41643-gobgp-has-remote-denial-of-service-panic-in)