HIGH

CVE-2026-12413

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libreswanAlmaLinux:10all versions · fixed in 5.3.2-1.el10_2and 1 other package
libreswanAlmaLinux:9all versions · fixed in 4.15-10.el9_8
libreswanAlmaLinux:8all versions · fixed in 4.12-2.el8_10.6

Vendor advisories

CVE-2026-12413 Red Hat Product Security93 products fixed · 2 known affected
librenswan: IKEv2 Denial of Service via malformed fragmentation
libreswan as a component of Red Hat OpenShift Container Platform 4 · libreswan.src as a component of Red Hat OpenShift Container Platform 4
RHSA-2026:72287 Red Hat Product Security5 products fixed
Red Hat Security Advisory: libreswan security update
RHSA-2026:63044 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.19.46 bug fix and security update
RHSA-2026:63041 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.21.32 bug fix and security update
RHSA-2026:63100 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.20.37 bug fix and security update
RHSA-2026:61779 Red Hat Product Security5 products fixed
Red Hat Security Advisory: libreswan security update

7 more advisories

Full record on NVD

Description

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 a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-07-02
Last Modified: 2026-07-02

Frequently asked questions

What is CVE-2026-12413?

Is CVE-2026-12413 actively exploited?

Active exploitation of CVE-2026-12413 has not been confirmed. Its EPSS score was 0.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-12413?

CVE-2026-12413 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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