---
title: "CVE-2026-118636: Apache MINA - Insecure Deserialization"
description: "Apache MINA 3.0 codec module contains an insecure deserialization vulnerability caused by JavaNativeMessageDecoder calling ObjectInputStream.readObject() without a class filter, letting attackers execute remote code via crafted frames, exploit requires untrusted peer interaction."
url: https://panop.io/threat-heartbeat/CVE-2026-118636/
---

# CVE-2026-118636 Apache MINA - Insecure Deserialization

Apache MINA 3.0 codec module contains an insecure deserialization vulnerability caused by JavaNativeMessageDecoder calling ObjectInputStream.readObject() without a class filter, letting attackers execute remote code via crafted frames, exploit requires untrusted peer interaction.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118636)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution

CVSS vector

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

Published

31 October 2026

Updated

1 November 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Use the latest Apache MINA 2.2.X branch as 3.0.0 branch is inactive and no fix will be released.

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-2026-118636](https://nvd.nist.gov/vuln/detail/CVE-2026-118636)
- [https://lists.apache.org/thread.html/h76nwcrkvsffhsk2kq6cjzc6srtnty7x](https://lists.apache.org/thread.html/h76nwcrkvsffhsk2kq6cjzc6srtnty7x)
- [https://www.cve.org/CVERecord?id=CVE-2026-118636](https://www.cve.org/CVERecord?id=CVE-2026-118636)
- [http://www.openwall.com/lists/oss-security/2026/10/31/3](http://www.openwall.com/lists/oss-security/2026/10/31/3)

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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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