---
id: CVE-2026-28532
title: FRRouting < 10.5.3 Integer Overflow in OSPF TLV Parser Functions
summary: >-
  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() macr…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-190
  - CWE-125
vendor: FRRouting
product: frr
affected:
  - frr < 10.5.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-05-01T16:36:13.274707Z'
published: '2026-04-30'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T15:19:54.314Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-28532'
references:
  - url: 'https://github.com/FRRouting/frr/releases/tag/frr-10.5.3'
  - url: 'https://github.com/FRRouting/frr/pull/21002'
  - url: >-
      https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd
  - url: >-
      https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions
tags:
  - cve.org
epss: 0.00374
epssPercentile: 0.28975
ingestedAt: '2026-10-01T15:48:17.866Z'
---

## Overview

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.

## Affected

- `frr < 10.5.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.