---
id: CVE-2026-78132
title: "strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for\_ietfAttrSyntax."
summary: "strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for\_ietfAttrSyntax."
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
vendor: strongswan
product: strongswan
affected:
  - 'strongswan >= 5.1.3, < 6.1.0'
patched:
  - strongswan 6.1.0
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:08:12.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78132'
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-2026-78132).html
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00315
epssPercentile: 0.21813
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T15:10:36.917536Z'
ingestedAt: '2026-09-11T16:45:47.859Z'
---

## Overview

strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for ietfAttrSyntax.

## Affected

- `strongswan >= 5.1.3, < 6.1.0`

## Remediation

Upgrade past the affected range:

- `strongswan 6.1.0`