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ALSA-2026:46396 — Important: libreswan security update

Affected: AlmaLinux:8: libreswan

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-v1_5) 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.

fkie_cve-2026-14957

In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the result is not NULL. However, CERT_ExtractPublicKey() returns NULL when public key extraction fails, for example if the RSA exponent is set to 0. A remote attacker can send a malformed X.509 certificate in a CERT payload to trigger the assertion, causing the pluto daemon to abort and restart. Continued exploitation causes a denial of service. No remote code execution is possible. Both IKEv1 and IKEv2 are affected. The vulnerability is only exploitable when both the OS and libreswan are running in FIPS mode and at least one CA certificate is loaded. The CERT payload is processed before peer authentication, so no credentials are needed to exploit this. Configurations using only PreSharedKey (PSK) authentication with no CA certificates loaded in the NSS database are not vulnerable.

GHSA-x2hf-3rgr-r89x

msrc_CVE-2026-14957 — FIPS mode assertion failure via malicious CERT payload

msrc_CVE-2026-14957

OESA-2026-3299 — libreswan security update

Affected: openEuler:24.03-LTS-SP3: libreswan, openEuler:24.03-LTS-SP4: libreswan, openEuler:20.03-LTS-SP4: libreswan, openEuler:22.03-LTS-SP4: libreswan, openEuler:24.03-LTS-SP1: libreswan

Libreswan is an implementation of IKEv1 and IKEv2 for IPsec. 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. Everything passing through the untrusted net is encrypted by the ipsec gateway machine and decrypted by the gateway at the other end of the tunnel. The resulting tunnel is a virtual private network or VPN. Security Fix(es):

A flaw was found in libreswan. A badly formatted X.509 certificate can cause an assertion failure (CWE-617) that crashes the pluto daemon process, leading to a denial of service.(CVE-2026-14957)

RHSA-2026:46396 — Red Hat Security Advisory: libreswan security update

librenswan: IKEv2 Denial of Service via malformed fragmentation libreswan: badly formatted X.509 certificate can cause an assertion failure that crashes the daemon process librenswan: IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload librenswan: IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

RHSA-2026:46986 — Red Hat Security Advisory: libreswan security update

RLSA-2026:46396 — Important: libreswan security update

Affected: Rocky Linux:8: libreswan

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-v1_5) 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.

UBUNTU-CVE-2026-14957

Affected: Ubuntu:18.04:LTS: libreswan, Ubuntu:20.04:LTS: libreswan, Ubuntu:22.04:LTS: libreswan, Ubuntu:24.04:LTS: libreswan, Ubuntu:26.04:LTS: libreswan