---
title: "CVE-2026-94453: Libreswan - Use After Free"
description: "Libreswan pluto daemon contains a use-after-free vulnerability caused by retaining invalid pointers after IKE over TCP client disconnects, letting remote attackers cause denial of service or possibly remote code execution, exploit requires IKE over TCP enabled with listen-tcp=yes."
url: https://panop.io/threat-heartbeat/CVE-2026-94453/
---

# CVE-2026-94453 Libreswan - Use After Free

Libreswan pluto daemon contains a use-after-free vulnerability caused by retaining invalid pointers after IKE over TCP client disconnects, letting remote attackers cause denial of service or possibly remote code execution, exploit requires IKE over TCP enabled with listen-tcp=yes.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.45% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-94453)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

13 October 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to the latest version with the vulnerability fixed or apply relevant patches.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-94453](https://nvd.nist.gov/vuln/detail/CVE-2026-94453)
- [https://libreswan.org/security/CVE-2026-94453/](https://libreswan.org/security/CVE-2026-94453/)
- [https://libreswan.org/security/CVE-2026-94453/CVE-2026-94453.txt](https://libreswan.org/security/CVE-2026-94453/CVE-2026-94453.txt)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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