CVE-2026-30405: Github.com/osrg/gobgp/v4 Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-4p9m-8gc4-rw2h
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2026-30405 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/osrg/gobgp/v4 libraries in the Go ecosystem. The issue involves gobgp vulnerable to a denial of service via the next_hop path attribute. Remediation is available by upgrading affected packages to version 4.4.0.

CVE-2026-30405 at a Glance

CVE Identifier CVE-2026-30405
GHSA Identifier GHSA-4p9m-8gc4-rw2h
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/osrg/gobgp/v4
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-30405

To remediate this vulnerability, upgrade all affected Github.com/osrg/gobgp/v4 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/osrg/gobgp/v4 fixed: 4.4.0 
Upgrade github.com/osrg/gobgp/v4 to 4.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/osrg/gobgp/v4

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-30405, inspect your project dependencies for Github.com/osrg/gobgp/v4:

inspect dependencies for github.com/osrg/gobgp/v4

Analyze the terminal output to locate any version of Github.com/osrg/gobgp/v4 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.4.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Github.com/osrg/gobgp/v4, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-30405 Affected Github.com/osrg/gobgp/v4 Versions

1 component(s)
Fixed Versions:
4.4.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/osrg/gobgp/v4
golang/github.com/osrg/gobgp/v4
Go
< 4.4.0
4.4.0

References

NVD — CVE-2026-30405 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30405
Github.com/osrg/gobgp/v4 Source Repository REPOSITORY
https://github.com/osrg/gobgp/issues/3305
Security Fix Commit FIX COMMIT
https://github.com/osrg/gobgp/commit/583080a7258e22cc884162e15b078771aa2c2c80
Github.com/osrg/gobgp/v4 Source Repository REPOSITORY
https://github.com/osrg/gobgp
Github.com/osrg/gobgp/v4 Release RELEASE
https://github.com/osrg/gobgp/releases/tag/v4.4.0

Frequently Asked Questions

What is CVE-2026-30405?
CVE-2026-30405 is a security vulnerability in Github.com/osrg/gobgp/v4 involving GoBGP vulnerable to a denial of service via the NEXT_HOP path attribute under CWE-400: Uncontrolled Resource Consumption.
Which Github.com/osrg/gobgp/v4 versions are affected?
Affected versions include releases prior to 4.4.0 across affected packages: github.com/osrg/gobgp/v4.
What version fixes CVE-2026-30405?
Upgrading to 4.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/osrg/gobgp/v4 affected?
Yes, github.com/osrg/gobgp/v4 is affected in releases prior to 4.4.0. Upgrade your dependency to 4.4.0 or later.
What is the CVSS score of CVE-2026-30405?
CVE-2026-30405 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-30405?
CVE-2026-30405 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2026-30405?
Run the dependency tree command: 'inspect dependencies for github.com/osrg/gobgp/v4'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4p9m-8gc4-rw2h",
  "modified" : "2026-10-02T22:40:10Z",
  "published" : "2026-03-16T18:32:03Z",
  "aliases" : [ "CVE-2026-30405" ],
  "summary" : "GoBGP vulnerable to a denial of service via the NEXT_HOP path attribute",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/osrg/gobgp/v4"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.3.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30405"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/issues/3305"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/commit/583080a7258e22cc884162e15b078771aa2c2c80"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/osrg/gobgp"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/releases/tag/v4.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-18T12:58:45Z",
    "nvd_published_at" : "2026-03-16T17:16:29Z"
  }
}