---
id: CVE-2026-78129
title: strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.
summary: strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
vendor: strongswan
product: strongswan
affected:
  - 'strongswan >= 4.6.2, < 6.1.0'
patched:
  - strongswan 6.1.0
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:08:56.593'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78129'
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-2026-78129).html
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00412
epssPercentile: 0.32686
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T14:16:33.445371Z'
ingestedAt: '2026-09-12T18:50:26.910Z'
---

## Overview

strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.

## Affected

- `strongswan >= 4.6.2, < 6.1.0`

## Remediation

Upgrade past the affected range:

- `strongswan 6.1.0`