IKEv2 pre-authentication Null Pointer Dereference in EAP code
CVE-2026-77206 is fixed in libreswan on 1 platform, first by RHSA-2026:89748, released October 27, 2026. It is not reported as exploited. Patch Radar priority: High.
Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN). Security Fix(es): * libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453) * libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206) * libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libreswan · RHEL 8 | 0:4.12-2.el8_10.7 | RHSA-2026:90492 | Oct 29, 2026 |
| libreswan · RHEL 9 | 0:4.15-11.el9_8 | RHSA-2026:89748 | Oct 27, 2026 |
| libreswan · almalinux 8 | 4.12-2.el8_10.7 | ALSA-2026:90492 | Nov 7, 2026 |
| libreswan · almalinux 9 | 4.15-11.el9_8 | ALSA-2026:89748 | Nov 7, 2026 |
| libreswan · ol 8 | 0:4.12-2.0.1.el8_10.7 | ELSA-2026-90492 | Nov 7, 2026 |
| libreswan · ol 9 | 0:4.15-11.0.1.el9_8 | ELSA-2026-89748 | Nov 7, 2026 |
| libreswan · rocky 8 | 0:4.12-2.el8_10.7 | RLSA-2026:90492 | Nov 7, 2026 |
| libreswan · rocky 9 | 0:4.15-11.el9_8 | RLSA-2026:89748 | Nov 7, 2026 |
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