# CVE-2026-7736: gobgp: A vulnerability was determined in osrg GoBGP up to 4.3.0

CVE-2026-7736 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-2026-7736
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 4, 2026

## Description

A vulnerability was determined in osrg GoBGP up to 4.3.0. Affected by this vulnerability is the function parseRibEntry of the file pkg/packet/mrt/mrt.go. Executing a manipulation can lead to integer underflow. It is possible to launch the attack remotely. Upgrading to version 4.4.0 addresses this issue. This patch is called 76d911046344a3923cbe573364197aa081944592. It is suggested to upgrade the affected component.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gobgp Debian 14 | 4.4.0-1 | [DEBIAN-CVE-2026-7736](https://patchblox.com/security/data/fix/linux/debian-cve-2026-7736.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 2026-11-08T06:59:42Z 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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