---
title: "CVE-2026-5124\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-5124?format=md
keywords: index, follow
---

# CVE-2026-5124

Publication date 30 March 2026

Last updated 10 July 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**3.7 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-5124?format=md#impact-score)

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## Description

A security vulnerability has been detected in osrg GoBGP up to 4.3.0.
Affected is the function BGPHeader.DecodeFromBytes of the file
pkg/packet/bgp/bgp.go of the component BGP Header Handler. The manipulation
leads to improper access controls. Remote exploitation of the attack is
possible. The attack is considered to have high complexity. The
exploitability is told to be difficult. The identifier of the patch is
f0f24a2a901cbf159260698211ab15c583ced131. To fix this issue, it is
recommended to deploy a patch.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| gobgp | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-5124?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-5124?format=md)

**Base score**

6.3 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | Low |
  | Vulnerable system - Availability impact | None |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.3 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-5124)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-5124)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-5124)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-5124)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-5124>
* <https://github.com/osrg/gobgp/pull/3340>