CVE-2026-78135

Publication date 7 September 2026

Last updated 21 September 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.6 · Medium

Score breakdown

Description

libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because CREATE_CHILD_SA requests are mishandled, there can be an authentication bypass.

Status

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

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.6 · Medium

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

References

Related Ubuntu Security Notices (USN)

    • USN-8789-1
    • strongSwan vulnerabilities
    • 21 September 2026

Other references

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