RHSA-2026:55449: Important: libreswan security update

Published Aug 17, 2026
·
Updated

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).Security Fix(es): librenswan: IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload (CVE-2026-50721) librenswan: IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v15) authentication payload (CVE-2026-50722) librenswan: IKEv2 Denial of Service via malformed fragmentation (CVE-2026-12413) libreswan: badly formatted X.509 certificate can cause an assertion failure that crashes the daemon process (CVE-2026-14957) For 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.

Affected Software

12 affected componentsFixes available
redhat/libreswan<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debuginfo<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debugsource<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debuginfo<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debugsource<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debuginfo<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan-debugsource<5.2-1.el10_0.5
5.2-1.el10_0.5
redhat/libreswan<5.2-1.el10_0.5.aa
5.2-1.el10_0.5.aa
redhat/libreswan-debuginfo<5.2-1.el10_0.5.aa
5.2-1.el10_0.5.aa
redhat/libreswan-debugsource<5.2-1.el10_0.5.aa
5.2-1.el10_0.5.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/libreswan to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5
  2. Upgrade

    Upgrade redhat/libreswan-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5
  3. Upgrade

    Upgrade redhat/libreswan-debugsource to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5
  4. Upgrade

    Upgrade redhat/libreswan to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5.aa
  5. Upgrade

    Upgrade redhat/libreswan-debuginfo to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5.aa
  6. Upgrade

    Upgrade redhat/libreswan-debugsource to a version that resolves this vulnerability.

    Fixed in 5.2-1.el10_0.5.aa
  7. Upgrade

    Upgrade librenswan to a version that resolves this vulnerability.

    Patch CVE-2026-50722
  8. Upgrade

    Upgrade librenswan to a version that resolves this vulnerability.

    Patch CVE-2026-12413
  9. Upgrade

    Upgrade libreswan to a version that resolves this vulnerability.

    Patch CVE-2026-14957
  10. Upgrade

    Upgrade librenswan to a version that resolves this vulnerability.

    Patch CVE-2026-50721

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
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