# CVE-2026-118636: Apache MINA: Unsafe Deserialization (CWE-502) in JavaNativeMessageDecoder

Status: published. Published: 2026-10-31. Updated: 2026-11-06.

**UNSUPPORTED WHEN ASSIGNED** 

JavaNativeMessageDecoder in the MINA 3.0 codec module calls ObjectInputStream.readObject() on frame bytes with no class filter, so an
application that puts it in front of an untrusted peer is open to gadget-chain RCE.

As the 3.0.0 branch is inactive, we do not plan to release a version that fixes this issue. 

Users are recommended to use the latest Apache MINA 2.2.X branch.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache MINA (org.apache.mina:mina-core): ≥ 3.0.0; ≤ 3.0.0-M2 (affected, maven). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: apache

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security@apache.org

- CISA KEV: No listing in collected sources

- EPSS: 0.57% as of 2026-11-05; percentile 47.58%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-502

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.cve.org/CVERecord?id=CVE-2026-118636 (CNA: apache; third-party-advisory)

- https://lists.apache.org/thread.html/h76nwcrkvsffhsk2kq6cjzc6srtnty7x (CNA: apache; vendor-advisory)

- http://www.openwall.com/lists/oss-security/2026/10/31/3 (ADP: CVE)

- https://lists.apache.org/thread.html/h76nwcrkvsffhsk2kq6cjzc6srtnty7x (security@apache.org)

- https://www.cve.org/CVERecord?id=CVE-2026-118636 (security@apache.org)

- http://www.openwall.com/lists/oss-security/2026/10/31/3 (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-118636; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-118636; retrieved 2026-11-03; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118636; retrieved 2026-11-06; source updated Not reported

Revision: 895ed7c3a2a5dac14a6196379dc42fb049e9b1951951dc997cb89307f987b0a5

Canonical: https://y2.dev/cve/CVE-2026-118636

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