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Fencer Vulns
high 7.5

CVE-2026-12413 json

IKEv2 Denial of Service via malformed fragmentation

published 2026-07-02 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-41439

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • The Libreswan Project libreswan 5.3.1
  • libreswan RHEL 9 5.3.2-1.el9fdp
  • libreswan RHEL 10.2 5.3.2-1.el10_2
  • libreswan-minimal RHEL 10.2 5.3.2-1.el10_2
  • libreswan RHEL 8 4.12-2.el8_10.6
  • libreswan RHEL 9 4.15-10.el9_8
  • libreswan RHEL 8.8 TUS, RHEL 8.8 E4S 4.9-3.el8_8.3
  • libreswan RHEL 9.2 E4S 4.9-5.el9_2.5
  • libreswan RHEL 9.4 E4S 4.12-3.el9_4.2

red hat advisories RHSA-2026:72287RHSA-2026:61779RHSA-2026:61258RHSA-2026:57741RHSA-2026:55449RHSA-2026:46986

  • libreswan AlmaLinux 8 4.12-2.el8_10.6
  • libreswan AlmaLinux 9 4.15-10.el9_8
  • libreswan AlmaLinux 10 5.3.2-1.el10_2
  • libreswan-minimal AlmaLinux 10 5.3.2-1.el10_2

almalinux advisories ALSA-2026:46396ALSA-2026:46397ALSA-2026:46398

  • libreswan Rocky Linux 10 5.3.2-1.el10_2
  • libreswan Rocky Linux 8 4.12-2.el8_10.6
  • libreswan Rocky Linux 9 4.15-10.el9_8

rocky linux advisories RLSA-2026:46398RLSA-2026:46396RLSA-2026:46397

  • libreswan Alpine 3.23 5.3.3-r0
  • libreswan Alpine 3.24 5.3.2-r0

alpine advisories ALPINE-CVE-2026-12413

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libreswan Azure Linux 3.0 4.15-2

azure linux advisories AZL-91779

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12413 updated cvss 7.5

librenswan: IKEv2 Denial of Service via malformed fragmentation

  • Red Hat OpenShift Container Platform 4 libreswan Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 9 libreswan 5.3.2-1.el9fdp
    fixed: vendor fix RHSA-2026:46986
  • Red Hat Enterprise Linux AppStream (v. 8) libreswan 4.12-2.el8_10.6
    fixed: vendor fix RHSA-2026:46396
  • Red Hat Enterprise Linux AppStream (v. 9) libreswan 4.15-10.el9_8
    fixed: vendor fix RHSA-2026:46397
  • Red Hat Enterprise Linux AppStream (v. 10) libreswan 5.3.2-1.el10_2, libreswan-minimal 5.3.2-1.el10_2
    fixed: vendor fix RHSA-2026:46398
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) libreswan 4.9-3.el8_8.3
    fixed: vendor fix RHSA-2026:72287
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libreswan 4.9-5.el9_2.5
    fixed: vendor fix RHSA-2026:61779
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) libreswan 4.12-3.el9_4.2
    fixed: vendor fix RHSA-2026:61258
show 7 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libreswan 5.2-1.el10_0.5
    fixed: vendor fix RHSA-2026:55449
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libreswan 4.15-8.el9_6.1
    fixed: vendor fix RHSA-2026:57741
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) libreswan 4.9-3.el8_8.3
    fixed: vendor fix RHSA-2026:72287
  • Red Hat OpenShift Container Platform 4.19 rhcos 4.19.9.6.202609021231
    fixed: vendor fix RHSA-2026:63044
  • Red Hat OpenShift Container Platform 4.20 rhcos 4.20.9.6.202609021029
    fixed: vendor fix RHSA-2026:63100
  • Red Hat OpenShift Container Platform 4.21 rhcos 4.21.9.6.202609021100
    fixed: vendor fix RHSA-2026:63041
  • Red Hat Enterprise Linux 6 libreswan Red Hat Enterprise Linux 7 libreswan Red Hat Enterprise Linux AppStream E4S (v.8.8) libreswan-debuginfo 4.9-3.el8_8.3, libreswan-debugsource 4.9-3.el8_8.3 Red Hat Enterprise Linux AppStream E4S (v.9.2) libreswan-debuginfo 4.9-5.el9_2.5, libreswan-debugsource 4.9-5.el9_2.5 Red Hat Enterprise Linux AppStream E4S (v.9.4) libreswan-debuginfo 4.12-3.el9_4.2, libreswan-debugsource 4.12-3.el9_4.2 Red Hat Enterprise Linux AppStream EUS (v. 10.0) libreswan-debuginfo 5.2-1.el10_0.5, libreswan-debugsource 5.2-1.el10_0.5
    +2 more products
    Red Hat Enterprise Linux AppStream EUS (v.9.6) libreswan-debuginfo 4.15-8.el9_6.1, libreswan-debugsource 4.15-8.el9_6.1 Red Hat Enterprise Linux AppStream TUS (v.8.8) libreswan-debuginfo 4.9-3.el8_8.3, libreswan-debugsource 4.9-3.el8_8.3
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • The Libreswan Project libreswan

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.