# CVE-2026-41643: gobgp: GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language

CVE-2026-41643 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-2026-41643
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 7, 2026

## Description

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gobgp Debian 14 | 4.3.0-1 | [DEBIAN-CVE-2026-41643](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41643.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 | 0.0.20260727T201416-160000.1.1 | [OPENSUSE-SU-2026:21551-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21551-1.md) | Aug 10, 2026 |
| Linux | govulncheck-vulndb sles 16.0 | 0.0.20260727T201416-160000.1.1 | [SUSE-SU-2026:23227-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23227-1.md) | Aug 10, 2026 |

---

Data as of 2026-11-09T01:18:40Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.