How severe is CVE-2026-12413?

CVE-2026-12413 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-12413 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-12413?

CVE-2026-12413 affects Libreswan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-12413?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-12413 published?

CVE-2026-12413 was published on 2026-07-02 and last updated on 2026-07-08.

CVE-2026-12413

CVE-2026-12413 is a high-severity vulnerability in Libreswan with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-193.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-193
Affected product: Libreswan
Published: 2026-07-02
Last modified: 2026-07-08

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.

Frequently asked questions

What is CVE-2026-12413?: 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.
How severe is CVE-2026-12413?: CVE-2026-12413 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-12413 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-12413?: CVE-2026-12413 affects Libreswan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-12413?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-12413 published?: CVE-2026-12413 was published on 2026-07-02 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:libreswan:libreswan:*:*:*:*:*:*:*:*

More vulnerabilities in Libreswan

CVE-2013-7283 — Critical (CVSS 9.3): Race condition in the libreswan.spec files for Red Hat Enterprise Linux (RHEL) and Fedora packages in libreswan 3.6 has…
CVE-2023-30570 — High (CVSS 7.5): pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and daemon crash) via…
CVE-2023-2295 — High (CVSS 7.5): A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is…
CVE-2022-23094 — High (CVSS 7.5): Libreswan 4.2 through 4.5 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon…
CVE-2020-1763 — High (CVSS 7.5): An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an…
CVE-2019-12312 — High (CVSS 7.5): In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart. An attacker can trigger a NULL pointer…

All CVEs affecting Libreswan →

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