CVE-2026-78134 Auth bypass in strongSwan

High 7.1 Published 11 Sep 2026 Updated 11 Sep 2026

Attackers can bypass authentication in strongSwan's EAP-TTLS and EAP-PEAP plugins due to missing or mismatched inner EAP identity checks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-78134?

CVE-2026-78134 is a high-severity authentication bypass vulnerability in strongSwan, published on 11 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

strongSwan 4.5.0 through 6.0.7 has Incorrect Access Control in the eap-ttls and eap-peap plugins because there can be a missing or mismatched inner EAP identity.

Weakness: CWE-863

Which versions are affected by CVE-2026-78134?

It affects 1 product.

Products include Strongswan Strongswan.

How do I fix CVE-2026-78134?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-78134 being exploited?

There is no known exploitation of CVE-2026-78134 in the wild and no public exploit code.

Sources

Also known as AZL-100034, DEBIAN-CVE-2026-78134, GHSA-rfvm-pvfp-c8vq, MINI-5g2p-h9p8-cvf7, UBUNTU-CVE-2026-78134.