How severe is CVE-2026-41635?

CVE-2026-41635 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41635 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41635?

CVE-2026-41635 affects Apache Mina. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41635?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-41635 have an EU (EUVD) identifier?

Yes. CVE-2026-41635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25796.

When was CVE-2026-41635 published?

CVE-2026-41635 was published on 2026-04-27 and last updated on 2026-06-17.

CVE-2026-41635

CVE-2026-41635 is a critical-severity vulnerability in Apache Mina with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25796
Weakness: CWE-502
Affected product: Apache Mina
Published: 2026-04-27
Last modified: 2026-06-17

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 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and 2.2.0 <= 2.2.5. The problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.

Frequently asked questions

What is CVE-2026-41635?: 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 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and 2.2.0 <= 2.2.5. The problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.
How severe is CVE-2026-41635?: CVE-2026-41635 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41635 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41635?: CVE-2026-41635 affects Apache Mina. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41635?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-41635 have an EU (EUVD) identifier?: Yes. CVE-2026-41635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25796.
When was CVE-2026-41635 published?: CVE-2026-41635 was published on 2026-04-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*

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