---
id: CVE-2026-78133
title: >-
  libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2
  rekeying collision handling.
summary: >-
  libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2
  rekeying collision handling.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: strongswan
product: strongswan
affected:
  - 'strongswan >= 6.0.0, < 6.1.0'
patched:
  - strongswan 6.1.0
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:07:44.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78133'
references:
  - url: 'https://github.com/strongswan/strongswan/releases/tag/6.1.0'
    label: cve@mitre.org
  - url: >-
      https://www.strongswan.org/blog/2026/09/07/strongswan-vulnerability-(cve-2026-78133).html
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00426
epssPercentile: 0.34126
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-11T16:53:54.390946Z'
ingestedAt: '2026-09-14T00:35:28.536Z'
---

## Overview

libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.

## Affected

- `strongswan >= 6.0.0, < 6.1.0`

## Remediation

Upgrade past the affected range:

- `strongswan 6.1.0`