---
title: "CVE-2026-28532\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-2026-28532?format=md
keywords: index, follow
---

# CVE-2026-28532

Publication date 30 April 2026

Last updated 6 June 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-28532?format=md#impact-score)

Toggle side navigation

## Description

FRRouting before 10.5.3 contains an integer overflow vulnerability in seven
OSPF Traffic Engineering and Segment Routing TLV parser functions where a
uint16\_t accumulator variable truncates uint32\_t values returned by the
TLV\_SIZE() macro, causing the loop termination condition to fail while
pointer advancement continues unchecked. Attackers with an established OSPF
adjacency can send a crafted LS Update packet with a malicious Type 10 or
Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all
affected routers in the OSPF area or autonomous system.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-28532?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| frr | 26.04 LTS resolute | Fixed 10.5.1-1ubuntu4.1 |
| 25.10 questing | Fixed 10.4.1-3ubuntu1.4 |
| 24.04 LTS noble | Fixed 8.4.4-1.1ubuntu6.7 |
| 22.04 LTS jammy | Fixed 8.1-1ubuntu1.16 |
| 20.04 LTS focal | Needs evaluation |
| quagga | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | 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)
* [Patch details](https://ubuntu.com/security/CVE-2026-28532?format=md#patch-details)

## Notes

---

### [sbeattie](https://launchpad.net/~sbeattie)

the quagga project was renamed to frr

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| frr | * Upstream:   [4b02ef9](https://github.com/FRRouting/frr/commit/4b02ef93ef15030cb2d3d84a078cfb92e2c0aa84) |

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-28532?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-28532?format=md)

**Base score**

6.0 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.0 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-28532)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-28532)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-28532)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-28532)

### Related Ubuntu Security Notices (USN)

+ [USN-8376-1](https://usn.ubuntu.com/USN-8376-1)
+ FRR vulnerabilities
+ 3 June 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-28532>
* <https://github.com/FRRouting/frr/pull/21002>