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VULNERABILITIES

CVE-2026-77205 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: Libreswan ProjectCVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://libreswan.org/security/CVE-2026-14957/CVE-2026-14957.txt Libreswan Project
https://libreswan.org/security/CVE-2026-77205/ Libreswan Project
https://libreswan.org/security/CVE-2026-77205/CVE-2026-77205.txt Libreswan Project

Weakness Enumeration

CWE-IDCWE NameSource
CWE-772Missing Release of Resource after Effective LifetimeLibreswan Project

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-77205
NVD Published Date:
Oct 13, 2026
NVD Last Modified:
Oct 16, 2026
Source:
Libreswan Project
CVE-2026-77205 Details - Not Deferred