CVE-2026-78129 Denial of service in strongSwan
An attacker can cause a denial of service in strongSwan by triggering an infinite loop during PKCS#5 decryption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78129?
CVE-2026-78129 is a medium-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 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.
Weakness: CWE-835
Which versions are affected by CVE-2026-78129?
It affects 1 product.
Products include Strongswan Strongswan.
How do I fix CVE-2026-78129?
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-2026-78129 being exploited?
There is no known exploitation of CVE-2026-78129 in the wild and no public exploit code.
Other vulnerabilities in strongSwan
Sources
Also known as AZL-100025, DEBIAN-CVE-2026-78129, GHSA-q5pg-prw5-6c62, MINI-wmw2-gm7v-rc28, UBUNTU-CVE-2026-78129.