Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41635 Incomplete Fix) (CVE-2026-42779) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-42779GHSA-VF5J-865M-MQ7C

Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41635 Incomplete Fix)

Answer in brief

CVE-2026-42779 records a Critical severity (CVSS 9.8) vulnerability in Apache MINA vulnerable to Deserialization of Untrusted Data (CVE-2026-41635 Incomplete Fix). The current sources do not mark it as known exploited. The current feed maps org.apache.mina:mina-core (maven), org.apache.mina:mina-core (maven). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 1, 2026Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps org.apache.mina:mina-core (maven), org.apache.mina:mina-core (maven). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
org.apache.mina:mina-coremaven	>=2.1.0 <2.1.12	2.1.12
org.apache.mina:mina-coremaven	>=2.2.0 <2.2.7	2.2.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for org.apache.mina:mina-core, org.apache.mina:mina-core.
Review the reported fix. Update org.apache.mina:mina-core to 2.1.12; org.apache.mina:mina-core to 2.2.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 1, 2026
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description: Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed. The fix checks if the class is present in the accepted class filter before calling Class.forName(). Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6. The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.

Quoted source text, attributed separately from HOL analysis.