CVE-2026-94453 Libreswan - Use After Free

Libreswan pluto daemon contains a use-after-free vulnerability caused by retaining invalid pointers after IKE over TCP client disconnects, letting remote attackers cause denial of service or possibly remote code execution, exploit requires IKE over TCP enabled with listen-tcp=yes.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the latest version with the vulnerability fixed or apply relevant patches.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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