SB2026071804 - Fedora 43 update for libreswan

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Main Vulnerability Database SB2026071804

SB2026071804 - Fedora 43 update for libreswan

Published: July 18, 2026

Security Bulletin ID SB2026071804
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-14957)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of a null return value in certificate public key extraction in programs/pluto/nss_cert_verify.c when processing a malformed X.509 CERT payload in FIPS mode. A remote attacker can send a specially crafted certificate payload to cause a denial of service.

Exploitation is only possible when the OS and libreswan are running in FIPS mode and at least one CA certificate is loaded. CERT payloads can be processed before peer authentication, and both IKEv1 and IKEv2 are affected.


Remediation

Install update from vendor's website.

References