CVE-2026-78127 Denial of service in strongSwan
A memory leak in the IKE message parser allows attackers to exhaust system memory, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78127?
CVE-2026-78127 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
libcharon in strongSwan 4.1.2 through 6.0.7 has a missing release of memory after its effective lifetime in the IKE message parser.
Weakness: CWE-401
Which versions are affected by CVE-2026-78127?
It affects 1 product.
Products include Strongswan Strongswan.
How do I fix CVE-2026-78127?
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-2026-78127 being exploited?
There is no known exploitation of CVE-2026-78127 in the wild and no public exploit code.
Other vulnerabilities in strongSwan
Sources
Also known as AZL-100040, DEBIAN-CVE-2026-78127, GHSA-j4c7-rfxg-2m4p, MINI-552h-vg93-xm96, UBUNTU-CVE-2026-78127.