# CVE-2026-37461: gobgp: An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Deni...

CVE-2026-37461 is fixed in 4 products on 1 platform, first by gobgpd 1.29-1ubuntu0.1+esm2, released May 7, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-37461
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 4, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gobgp Debian 14 | 4.4.0-1 | [DEBIAN-CVE-2026-37461](https://patchblox.com/security/data/fix/linux/debian-cve-2026-37461.md) | May 15, 2026 |
| Linux | gobgpd Ubuntu 18.04.6 LTS (bionic) | 1.29-1ubuntu0.1+esm2 | [gobgpd 1.29-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gobgpd-1.29-1ubuntu0.1-esm2.md) | May 7, 2026 |
| Linux | gobgpd Ubuntu 20.04 LTS (focal) | 2.12.0-1ubuntu0.1~esm3 | [gobgpd 2.12.0-1ubuntu0.1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gobgpd-2.12.0-1ubuntu0.1-esm3.md) | May 7, 2026 |
| Linux | gobgpd Ubuntu 22.04.1 LTS (jammy) | 2.25.0-3ubuntu0.1+esm4 | [gobgpd 2.25.0-3ubuntu0.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gobgpd-2.25.0-3ubuntu0.1-esm4.md) | May 7, 2026 |
| Linux | gobgpd Ubuntu 24.04.5 LTS (noble) | 3.23.0-1ubuntu0.3+esm4 | [gobgpd 3.23.0-1ubuntu0.3+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gobgpd-3.23.0-1ubuntu0.3-esm4.md) | May 7, 2026 |
| Linux | gobgpd Ubuntu 26.04.1 LTS (resolute) | 3.36.0-2ubuntu0.1~esm1 | [gobgpd 3.36.0-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gobgpd-3.36.0-2ubuntu0.1-esm1.md) | May 7, 2026 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 18.04.6 LTS (bionic) | 1.29-1ubuntu0.1+esm2 | [golang-github-osrg-gobgp-dev 1.29-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-osrg-gobgp-dev-1.29-1ubuntu0.1-esm2.md) | May 7, 2026 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 20.04 LTS (focal) | 2.12.0-1ubuntu0.1~esm3 | [golang-github-osrg-gobgp-dev 2.12.0-1ubuntu0.1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-osrg-gobgp-dev-2.12.0-1ubuntu0.1-esm3.md) | May 7, 2026 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 22.04.1 LTS (jammy) | 2.25.0-3ubuntu0.1+esm4 | [golang-github-osrg-gobgp-dev 2.25.0-3ubuntu0.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-osrg-gobgp-dev-2.25.0-3ubuntu0.1-esm4.md) | May 7, 2026 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 24.04.5 LTS (noble) | 3.23.0-1ubuntu0.3+esm4 | [golang-github-osrg-gobgp-dev 3.23.0-1ubuntu0.3+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-github-osrg-gobgp-dev-3.23.0-1ubuntu0.3-esm4.md) | May 7, 2026 |
| Linux | golang-github-osrg-gobgp-dev Ubuntu 26.04.1 LTS (resolute) | 3.36.0-2ubuntu0.1~esm1 | [golang-github-osrg-gobgp-dev 3.36.0-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-golang-github-osrg-gobgp-dev-3.36.0-2ubuntu0.1-esm1.md) | May 7, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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