CVE-2026-94453: high-severity vulnerability in The Libreswan Project libreswan
IKEv2 Use-After-Free bug when using IKE-over-TCP
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
The Libreswan Project · libreswanRelated CVEs — The Libreswan Project libreswan
In the same product, most dangerous first.
CVE-2026-77206HIGHIKEv2 pre-authentication Null Pointer Dereference in EAP codeEPSS 0.7%CVE-2026-12413HIGHIKEv2 Denial of Service via malformed fragmentationEPSS 0.6%CVE-2026-14957HIGHFIPS mode assertion failure via malicious CERT payloadEPSS 0.5%CVE-2026-77207HIGHNull Pointer Dereference in PKCS#7 bundle with no certificatesEPSS 0.5%CVE-2026-50721HIGHIKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payloadEPSS 0.4%CVE-2026-50722HIGHIKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payloadEPSS 0.3%