CVE-2026-42779Public exploitNetwork attack vector

Remote code execution via deserialization allowlist bypass

Published May 1, 2026 · Updated May 1, 2026

Deserialization filter bypass in Apache MINA 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6 allows remote attackers to execute code. AbstractIoBuffer.resolveClass() skips the acceptMatchers class-name allowlist for static classes and primitive types, then loads the attacker-selected class with Class.forName(). Exposure requires an application to call IoBuffer.getObject(), including through ObjectSerializationCodecFactory, and successful exploitation runs code in that application's process.

CVSS severity9.8
Critical
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization filter bypass in Apache MINA 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6 allows remote attackers to execute code. AbstractIoBuffer.resolveClass() skips the acceptMatchers class-name allowlist for static classes and primitive types, then loads the attacker-selected class with Class.forName(). Exposure requires an application to call IoBuffer.getObject(), including through ObjectSerializationCodecFactory, and successful exploitation runs code in that application's process.

The record

CVE
CVE-2026-42779
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Apache Software Foundation
Product
Apache MINA
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1.X <=2.1.11
  2. Affected versionversion=2.2.X <=2.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache MINAversion=2.1.X <=2.1.11; version=2.2.X <=2.2.6

Published CVSS scores

9.8Apache Software FoundationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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