Vulnerability · Published Sep 11, 2026 · Assigned by mitre
CVE-2026-78133
High 7.5
In plain English
A high-severity use-after-free in strongSwan from strongSwan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 59.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | strongswan | 6.0.1-6+deb13u7 | DEBIAN-CVE-2026-78133 |
| Debian:14 | strongswan | 6.1.0-1 | DEBIAN-CVE-2026-78133 |
| Ubuntu:22.04:LTS | strongswan | 5.9.5-2ubuntu2.8 | USN-8789-1 |
| Ubuntu:24.04:LTS | strongswan | 5.9.13-2ubuntu4.24.04.5 | USN-8789-1 |
| Ubuntu:26.04:LTS | strongswan | 6.0.4-1ubuntu3.2 | UBUNTU-CVE-2026-78133 |
| Ubuntu:26.04:LTS | strongswan | 6.0.4-1ubuntu3.2 | USN-8789-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| strongSwan | strongSwan | 6.0.0 – before 6.1.0 |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H