CVE-2026-78132 Denial of service in strongSwan

High 7.5 Published 11 Sep 2026 Updated 14 Sep 2026

An attacker can cause a denial of service in strongSwan by triggering an infinite loop in the x509 attribute certificate parser.

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

What is CVE-2026-78132?

CVE-2026-78132 is a high-severity denial of service vulnerability in strongSwan, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-835

Which versions are affected by CVE-2026-78132?

It affects 1 product.

Products include Strongswan Strongswan.

How do I fix CVE-2026-78132?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-78132 being exploited?

There is no known exploitation of CVE-2026-78132 in the wild and no public exploit code.

Sources

Also known as AZL-100046, DEBIAN-CVE-2026-78132, GHSA-rv8v-63hf-3gj7, MINI-m798-9r4m-254q, UBUNTU-CVE-2026-78132.