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    CVE-2026-77206

    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->sa.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.

    Published:Oct 5, 2026
    Last Modified:Oct 26, 2026
    EPS:Oct 13, 2026
    EPSS Score:0.00658
    CVSS Score:7.5

    Affected Products

    Vendor
    Libreswan
    Product
    Libreswan

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-77207 (CVSS 7.5) — Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. W…
    CVE-2026-14957 (CVSS 7.5) — In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the resul…
    CVE-2026-50722 (CVSS 8.1) — Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER …
    CVE-2026-50721 (CVSS 8.1) — Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of …
    CVE-2026-12413 (CVSS 7.5) — An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploi…
    CVE-2024-3652 (CVSS 6.5) — The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifyin…
    CVE-2023-38712 (CVSS 6.5) — An issue was discovered in Libreswan 3.x and 4.x before 4.12. When an IKEv1 ISAKMP SA Informational Exchange p…
    CVE-2023-38710 (CVSS 6.5) — An issue was discovered in Libreswan before 4.12. When an IKEv2 Child SA REKEY packet contains an invalid IPse…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High