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VulnerabilityPublished Updated

CVE-2026-42779: Mina2 · The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches

Affects mina2Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-42779· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical · fixed in 2.1.12 : patch mina2 as a priority.

Data as of 9 Nov 2026, 14:18 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 2.1.12
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10mina2pkg:deb/ubuntu/mina2?arch=source&distro=stonkingOther threatsAffected
  • =2.2.1-4
  • =2.2.1-4ubuntu1
  • =2.2.9-1
Fixed in–
Ubuntu 25.10mina2pkg:deb/ubuntu/mina2?arch=source&distro=questingOther threatsAffected
  • =2.2.1-3
  • =2.2.1-4
Fixed in–
Ubuntu Pro 24.04 LTSmina2pkg:deb/ubuntu/mina2?arch=source&distro=esm-apps/nobleOther threatsAffected
  • =2.2.1-3
  • =2.2.1-3ubuntu0.1~esm1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Apache MINA to version 2.1.12 or later, or 2.2.7 or later, where the classname allowlist check is correctly applied. This is the official fix resolving the vulnerability. No other mitigations are indicated by the vendor advisory.

Description

Apache MINA versions 2.1.0 through 2.1.11 and 2.2.0 through 2.2.6 contain a vulnerability where the classname allowlist check is bypassed in AbstractIoBuffer.resolveClass(), allowing arbitrary code execution. This occurs because one code branch does not verify the class against the allowlist before calling Class.forName(). The issue is fixed in versions 2.1.12 and 2.2.7 by applying the classname allowlist earlier. Applications using Apache MINA that invoke IoBuffer.getObject() are affected and should upgrade to the fixed versions.

References

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