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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache MINA | 2.2.X – ≤ 2.2.6, 2.1.X – ≤ 2.1.11 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mina2 | No fix yet | — |
| Ubuntu 25.10 | mina2 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | mina2 | 2.2.1-4ubuntu0.1~esm1 | USN-8465-1 |
| Ubuntu Pro 24.04 LTS | mina2 | 2.2.1-3ubuntu0.1~esm1 | USN-8465-1 |
| Ubuntu Pro 22.04 LTS | mina2 | 2.1.5-1ubuntu0.1~esm1 | USN-8465-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | apache-nifi | 2.9.0-r5 | — |
| Wolfi rolling | jenkins-2-openjdk-21 +1 | 2.564-r1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
dinosn/CVE-2026-42779 ★ 11 · May 2, 2026
CVE-2026-42779: Apache MINA AbstractIoBuffer.resolveClass() deserialization filter bypass to RCE (CVSS 9.8)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.mina:mina-core | >= 2.1.0, < 2.1.12 | 2.1.12 | GHSA-vf5j-865m-mq7c |
| Maven | org.apache.mina:mina-core | >= 2.2.0, < 2.2.7 | 2.2.7 | GHSA-vf5j-865m-mq7c |
Advisories 8
- WID-SEC-2026-2437 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 22, 2026
- NCSC-2026-0448 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Oct 22, 2026
- WID-SEC-2026-4078 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 2026
- NCSC-2026-0309 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Aug 19, 2026
- WID-SEC-2026-2887 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 18, 2026
- NCSC-2026-0256 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jul 22, 2026
- WID-SEC-2026-2260 IBM Operational Decision Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 8, 2026
- USN-8465-1 mina2 vulnerabilities Ubuntu Security Notices (USN) · Jun 24, 2026
References
- https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0 vendor-advisory