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OpenAdvisories
High RHSA-2026:57741 4 CVEs

Red Hat Security Advisory: libreswan security update

Published Aug 21, 2026 · Updated Oct 20, 2026

Ecosystem: Red Hat

Fixed packages 1

ReleasePackageFixed in
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::appstream libreswan 0:4.15-8.el9_6.1

Vulnerabilities 4

  • High 8.1
    CVE-2026-50721

    IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload

    Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a…

    The Libreswan Project libreswan libreswan libreswan Debian Ubuntu Azure Linux Alpine
  • High 8.1
    CVE-2026-50722

    IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

    Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the…

    The Libreswan Project libreswan libreswan libreswan Debian Ubuntu Azure Linux Alpine
  • High 7.5
    CVE-2026-12413 Public exploit

    IKEv2 Denial of Service via malformed fragmentation

    An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in …

    The Libreswan Project libreswan libreswan libreswan Debian Ubuntu Azure Linux Alpine
  • High 7.5
    CVE-2026-14957

    FIPS mode assertion failure via malicious CERT payload

    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 …

    The Libreswan Project libreswan libreswan libreswan Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2494147
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2494148
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2494149
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2501764
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_57741.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-12413
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-12413
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-12413
  • article
    https://libreswan.org/security/CVE-2026-12413/
  • article
    https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt
  • article
    https://lists.libreswan.org/archives/list/swan-announce@lists.libreswan.org/thread/7BZBYREBGXFPS4TSWOZX37WABRZVLK74/
  • report
    https://access.redhat.com/security/cve/CVE-2026-14957
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-14957
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-14957
  • article
    https://libreswan.org/security/CVE-2026-14957/
  • article
    https://libreswan.org/security/CVE-2026-14957/CVE-2026-14957.txt
  • report
    https://access.redhat.com/security/cve/CVE-2026-50721
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-50721
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-50721
  • article
    https://libreswan.org/security/CVE-2026-50721/
  • article
    https://libreswan.org/security/CVE-2026-50721/CVE-2026-50721.txt
  • report
    https://access.redhat.com/security/cve/CVE-2026-50722
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-50722
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-50722
  • article
    https://libreswan.org/security/CVE-2026-50722
  • article
    https://libreswan.org/security/CVE-2026-50722/
  • article
    https://libreswan.org/security/CVE-2026-50722/CVE-2026-50722.txt