{"id":"CVE-2026-77206","aliases":["ALPINE-CVE-2026-77206","ALSA-2026:89748","ALSA-2026:90492","AZL-108030","DEBIAN-CVE-2026-77206","EUVD-2026-100748","GHSA-37xg-hvw9-pr82","RLSA-2026:89748","RLSA-2026:90492","RLSA-2026:97878","UBUNTU-CVE-2026-77206"],"status":"published","title":"IKEv2 pre-authentication Null Pointer Dereference in EAP code","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00658,"percentile":0.51958,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2026-10-13T21:28:11Z","modified":"2026-11-11T00:30:02Z","fixes":[{"ecosystem":"Alpine:v3.23","package":"libreswan","fixed_in":["5.3.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"libreswan","fixed_in":["5.3.3-r0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.23","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.3-r0"}]}]},{"source":"osv","ecosystem":"AlmaLinux:9","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15-11.el9_8"}]}],"bundled":3},{"source":"osv","ecosystem":"AlmaLinux:8","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.12-2.el8_10.7"}]}],"bundled":3},{"source":"osv","ecosystem":"Azure Linux:3","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.15-3"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.10-2","4.10-2+deb12u1","4.11-1","4.12-1","4.12-2","4.12-3","4.14-1","4.14-1.1","4.15-1","5.0~rc2-1","5.0~rc2-2","5.2-1","5.2-2","5.2-2.1","5.2-2.2","5.2-2.3","5.2-2.4","5.2-2.5"]},{"source":"osv","ecosystem":"Debian:13","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2-2.2","5.2-2.3","5.2-2.4","5.2-2.5"]},{"source":"osv","ecosystem":"Rocky Linux:9","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.15-11.el9_8"}]}],"bundled":3},{"source":"osv","ecosystem":"Rocky Linux:8","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.12-2.el8_10.7"}]}],"bundled":3},{"source":"osv","ecosystem":"Rocky Linux:9","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.15-11.el9_8"}]}],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.20-7build1","3.21-2","3.22-1","3.22-2","3.22-3","3.22-4","3.23-1","3.23-4"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.29-2","3.29-2build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.32-3ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11-1ubuntu1","4.12-1ubuntu1","4.14-1ubuntu1","4.14-1ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2-2.2ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libreswan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2-2.2ubuntu1","5.2-2.2ubuntu2"]}],"products":[{"vendor":"the libreswan project","product":"libreswan"},{"vendor":"the libreswan project (www.libreswan.org)","product":"libreswan"}],"references":[{"url":"https://libreswan.org/security/CVE-2026-77206/CVE-2026-77206.txt","tags":["vendor-advisory","report"]},{"url":"https://libreswan.org/security/CVE-2026-77206/","tags":["patch","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77206","tags":["web"]},{"url":"https://libreswan.org/security/CVE-2026-77206"},{"url":"https://github.com/advisories/GHSA-37xg-hvw9-pr82"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-77206","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:89748","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-77206","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-77207","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-94453","tags":["report"]},{"url":"https://bugzilla.redhat.com/2550254","tags":["report"]},{"url":"https://bugzilla.redhat.com/2550256","tags":["report"]},{"url":"https://bugzilla.redhat.com/2550258","tags":["report"]},{"url":"https://errata.almalinux.org/9/ALSA-2026-89748.html","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:90492","tags":["advisory"]},{"url":"https://errata.almalinux.org/8/ALSA-2026-90492.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77206","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:89748","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550254","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550256","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550258","tags":["report"]},{"url":"https://errata.rockylinux.org/RLSA-2026:90492","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2026:97878","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:97878","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-77206","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77206","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-77206","title":"IKEv2 pre-authentication Null Pointer Dereference in EAP code","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T21:28:11.498Z","modified":"2026-10-16T15:31:54.304Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:20:16.072351Z"}],"euvd":[{"id":"EUVD-2026-100748","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T21:28:11Z","modified":"2026-10-16T15:31:54Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:00:05.229655Z"}],"ghsa":[{"id":"GHSA-37xg-hvw9-pr82","title":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for...","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-14T00:31:47Z","modified":"2026-10-14T00:31:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T15:13:22.12395Z"}],"nvd":[{"id":"CVE-2026-77206","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T22:18:24.727Z","modified":"2026-10-16T19:55:59.74Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:12:58.630796Z"}],"osv":[{"id":"ALPINE-CVE-2026-77206","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T22:18:24.727Z","modified":"2026-11-03T06:32:57.087466921Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T07:16:26.770911Z"},{"id":"DEBIAN-CVE-2026-77206","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T22:18:24.727Z","modified":"2026-11-05T17:31:22.12349818Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-05T17:54:24.591011Z"},{"id":"RLSA-2026:89748","title":"Important: libreswan security update","description":"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).\n\nSecurity Fix(es):\n\n* libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)\n\n* libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)\n\n* libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)\n\nFor 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.","status":"published","published":"2026-10-27T12:04:29.081572Z","modified":"2026-10-27T12:30:05.432064169Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.76659Z"},{"id":"RLSA-2026:90492","title":"Important: libreswan security update","description":"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).\n\nSecurity Fix(es):\n\n* libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)\n\n* libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)\n\n* libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)\n\nFor 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.","status":"published","published":"2026-10-29T12:01:16.697685Z","modified":"2026-10-29T12:30:02.479921833Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.76659Z"},{"id":"RLSA-2026:97878","title":"Important: libreswan security update","description":"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).\n\nSecurity Fix(es):\n\n* libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)\n\n* libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)\n\n* libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)\n\nFor 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.","status":"published","published":"2026-11-11T00:04:53.161685Z","modified":"2026-11-11T00:30:02.557018077Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-11T00:46:19.477003Z"},{"id":"UBUNTU-CVE-2026-77206","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T22:18:00Z","modified":"2026-10-17T13:01:08.238328387Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:13.483205Z"},{"id":"ALSA-2026:89748","title":"Important: libreswan security update","description":"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).  \n\nSecurity Fix(es):  \n\n  * libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)\n  * libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)\n  * libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)\n\n\nFor 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.\n","status":"published","published":"2026-10-26T00:00:00Z","modified":"2026-10-29T11:32:32.888538514Z","updated_at":"2026-11-02T15:27:57.367731Z"},{"id":"ALSA-2026:90492","title":"Important: libreswan security update","description":"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).  \n\nSecurity Fix(es):  \n\n  * libreswan: IKEv2 Use-After-Free bug when using IKE-over-TCP (CVE-2026-94453)\n  * libreswan: IKEv2 pre-authentication Null Pointer deref in EAP code (CVE-2026-77206)\n  * libreswan: Null Pointer Dereference in PKCS#7 bundle with no CERTS (CVE-2026-77207)\n\n\nFor 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.\n","status":"published","published":"2026-10-26T00:00:00Z","modified":"2026-10-29T11:02:25.439885196Z","updated_at":"2026-11-02T15:27:57.367731Z"},{"id":"AZL-108030","title":"CVE-2026-77206 affecting package libreswan 4.15-3","description":"Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike-\u003esa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.","status":"published","published":"2026-10-13T22:18:24Z","modified":"2026-10-15T05:37:09Z","updated_at":"2026-11-02T15:28:01.725816Z"}]}}