CVE-2026-78129

Publication date 7 September 2026

Last updated 21 September 2026

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

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

Status

Show unmaintained releases

Package	Ubuntu Release	Status
strongswan	26.04 LTS resolute	Fixed 6.0.4-1ubuntu3.2
	24.04 LTS noble	Fixed 5.9.13-2ubuntu4.24.04.5
	22.04 LTS jammy	Fixed 5.9.5-2ubuntu2.8
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
strongswan	Upstream: https://download.strongswan.org/security/CVE-2026-78129/strongswan-5.1.0-6.0.7_pkcs5_params_dos.patch

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.9 · Medium

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	5.9 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-8789-1
strongSwan vulnerabilities
21 September 2026

Other references

Access our resources on patching vulnerabilities