CVE-2026-78131 Denial of service in strongSwan
Attackers can cause a denial of service in strongSwan by triggering a memory leak 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-2026-78131?
CVE-2026-78131 is a low-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 4.2.0 through 6.0.7 has a missing release of memory after its effective lifetime in the x509 plugin's attribute certificate parser.
Weakness: CWE-401
Which versions are affected by CVE-2026-78131?
It affects 1 product.
Products include Strongswan Strongswan.
How do I fix CVE-2026-78131?
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-2026-78131 being exploited?
There is no known exploitation of CVE-2026-78131 in the wild and no public exploit code.
Other vulnerabilities in strongSwan
Sources
Also known as AZL-100031, DEBIAN-CVE-2026-78131, GHSA-9f4g-f7vv-f9gh, MINI-fm87-c94f-gwwj, UBUNTU-CVE-2026-78131.