CVE-2026-37461: Github.com/osrg/gobgp/v4 GoBGP Has An Out-of-bounds Read Vulnerability

HIGH
Advisory Identifier: GHSA-wmvj-f67g-qg4g
Share
CVSS 7.5
CWE-125
Published
Advisory Summary

CVE-2026-37461 is a HIGH (CVSS 7.5) gobgp has an out-of-bounds read vulnerability (CWE-125: Out-of-bounds Read) affecting Github.com/osrg/gobgp/v4 libraries in the Go ecosystem. The issue involves gobgp has an out-of-bounds read in the parseip6extended function. Remediation is available by upgrading affected packages to version 4.4.0.

CVE-2026-37461 at a Glance

CVE Identifier CVE-2026-37461
GHSA Identifier GHSA-wmvj-f67g-qg4g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-125: Out-of-bounds Read
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-2026-37461

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-2026-37461, 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-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. 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 out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

CVE-2026-37461 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-2026-37461 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-37461
Security Fix Commit FIX COMMIT
https://github.com/osrg/gobgp/commit/362cce3e325f56e7a4f792ccb9689b3bdda9e682
Security Fix Commit FIX COMMIT
https://github.com/osrg/gobgp/commit/9ce8936672ebc07df524da77fa4c6ae26d92be6d
Github.com/osrg/gobgp/v4 Source Repository REPOSITORY
https://github.com/osrg/gobgp
Github.com/osrg/gobgp/v4 Source Repository REPOSITORY
https://github.com/osrg/gobgp/blob/v4.3.0/pkg/packet/bgp/bgp.go

Frequently Asked Questions

What is CVE-2026-37461?
CVE-2026-37461 is a security vulnerability in Github.com/osrg/gobgp/v4 involving GoBGP has an out-of-bounds read in the ParseIP6Extended function under CWE-125: Out-of-bounds Read.
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-2026-37461?
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-2026-37461?
CVE-2026-37461 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-2026-37461?
CVE-2026-37461 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check Go dependencies for CVE-2026-37461?
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-wmvj-f67g-qg4g",
  "modified" : "2026-05-08T17:47:17Z",
  "published" : "2026-05-04T18:30:30Z",
  "aliases" : [ "CVE-2026-37461" ],
  "summary" : "GoBGP has an out-of-bounds read in the ParseIP6Extended function",
  "details" : "An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.",
  "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"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-37461"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/commit/362cce3e325f56e7a4f792ccb9689b3bdda9e682"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/commit/9ce8936672ebc07df524da77fa4c6ae26d92be6d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/osrg/gobgp"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/osrg/gobgp/blob/v4.3.0/pkg/packet/bgp/bgp.go"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-08T17:47:17Z",
    "nvd_published_at" : "2026-05-04T17:16:23Z"
  }
}