CVE-2026-12413Disclosure(libreswan / libreswan)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch libreswan libreswan systems immediately

Recommended action window: Monitor and triage in normal cycle

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.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Weakness type (CWE)

CWE-193CWE-617

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

libreswan

Threat summary

Patch or workaround signal is available
3 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 3 signals
Disclosure: 3 classified signals
Peaked 1d ago at 2 mentions (2026-07-02); latest day: 1
3 total mentions across 2 days

Affected systems

Vendors

libreswan

Products

libreswan

Deep dive

Activity timeline3 mentions / 2d

Signal classification1 categories

Disclosure

3100.0%

Referenced assets2 URLs

By indicator

Classification over time

Date	Total	Labels

2026-07-02	2	Disclosure2
2026-07-03	1	Disclosure1

Full discourse3 posts

Upwind Security MDR@UpwindMDR91d
Disclosure
🚨High - Libreswan pluto IKEv2 Fragment DoS via Off-by-One Assertion (CVE-2026-12413) An invalidly formatted IKEv2 fragment crashes Libreswan's pluto daemon. reassemble_v2_incoming_fragments() ignores unknown outer payloads but still stores them in the fixed-size msg_digest.digest[PAYLIMIT] array, and an off-by-one in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) makes the daemon abort. The daemon crashes, and restarts, and repeated packets create a persistent denial of service that drops IPsec VPN tunnels. No RCE is possible. Any config allowing IKEv2 connections that don't set fragmentation=no is affected; IKEv1 is not. 👉Upgrade Libreswan to 5.3.1.
Post summary
A high‑severity off‑by‑one denial‑of‑service vulnerability (CVE‑2026‑12413) in Libreswan's pluto daemon is disclosed with detailed technical context, and users are advised to upgrade to version 5.3.1 to remediate the issue.
0001086
236 followersView on X
Infoflowcloud@infoflowcloud91d
Disclosure
🚨*CVE* 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 rea… https://www.cve.org/CVERecord?id=CVE-2026-12413 ----- Traducción: CVE-2026-12413 Un … http://infoflow.cloud`
Post summary
The post discloses CVE-2026-12413, a DoS flaw in Libreswan’s IKEv2 processing, listing the vulnerability details but no PoC, exploit, or patch information.
0000040
91 followersView on X
CVE@CVEnew91d
Disclosure
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 rea… https://www.cve.org/CVERecord?id=CVE-2026-12413
Post summary
CVE-2026-12413 details a crash vulnerability in Libreswan's pluto daemon triggered by malformed IKEv2 fragments, potentially leading to denial of service.
00000665
57.7K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	libreswan	libreswan	-	-	-

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