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Critical 2 vendors · 3 advisories

CVE-2026-41635: Apache MINA's AbstractIoBuffer.resolveClass contains two branches, one of them (for static classes or primitive types) does

CVE-2026-41635 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Critical
CVSS base score
9.8 (Apache), 9.8 (Red Hat)
Weakness
CWE-502
Fixed releases
  • Apache: 2.0.28, 2.1.11, 2.2.6
  • Red Hat: RHSA-2026:17668
Vendor advisories
3 from Apache, Red Hat
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-41635; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-41635?

Upgrade to a fixed release named by the vendor:

  • Apache: 2.0.28, 2.1.11, 2.2.6
  • Red Hat: RHSA-2026:17668
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:17668 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisories for CVE-2026-41635

Apache

2 advisories
  • Advisory severityCritical9.8

    Critical [CVE-2026-41635 +1] Apache MINA: The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches.

    CVE-2026-42779Source published Source updated

    This bulletin covers 2 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.

    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 in this advisory
    • Apache MINA
    Source-reported affected versions
    • 2.1.0
    • 2.1.11
    • 2.2.0
    • 2.2.6
    Source-reported fixed versions
    • 2.1.12
    • 2.2.7
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin
  • Advisory severityCritical9.8

    Critical [CVE-2026-41635] Apache MINA's AbstractIoBuffer.resolveClass contains two branches, one of them (for static classes or primitive types) does…

    CVE-2026-41635Source published Source updated

    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.

    Affected products in this advisory
    • Apache MINA
    Source-reported affected versions
    • 2.0.0
    • 2.0.27
    • 2.1.0
    • 2.1.10

    2 more entries in the full advisory.

    Source-reported fixed versions
    • 2.0.28
    • 2.1.11
    • 2.2.6
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityCritical9.8

    Critical [CVE-2026-41635] Arbitrary code execution via classname allowlist bypass

    CVE-2026-41635Source published

    Arbitrary code execution via classname allowlist bypass. Red Hat rates this low (CVSS 9.8). Weakness: CWE-502. Affected package(s): mina-core. Resolved in Red Hat advisory RHSA-2026:17668 — update the affected packages (`sudo dnf update`).

    Related products — impact not confirmed
    • mina-core
    • Red Hat Enterprise Linux
    Source-reported affected versions
    • mina-core
    Source-reported fixed versions
    • RHSA-2026:17668
    Mitigation guidance
    • Update the affected package(s) to the fixed version shipped in RHSA-2026:17668 (`sudo dnf update` / `yum update`).
    Full advisory and evidenceOpen source bulletin

References

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