CVE Feed

    Dashboard / CVE / CVE-2026-77205

    CVE-2026-77205

    Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimate peers from connecting. The add_decoded_cert() function missed a call to CERT_DestroyCertificate() due to an incorrect fix for CVE-2026-14957. Sending bogus certificates with new serial numbers could prevent the real certificates with those serial numbers from connecting until the service has restarted.

    Published:Oct 5, 2026
    Last Modified:Oct 26, 2026
    EPS:Oct 13, 2026
    EPSS Score:0.00183
    CVSS Score:3.7

    Affected Products

    Vendor
    Libreswan
    Product
    Libreswan

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

    Related CVEs

    CVE-2026-77206 (CVSS 7.5) — Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication…
    CVE-2026-94453 (CVSS 7.5) — Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes…
    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