Skip to main content
Public proof of conceptFix available

CVE-2026-42779

A public proof of concept exists; no exploitation attested.

  • Published2026-05-01
  • Fixed in2.2.7 · 2.1.12
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-05-0111:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-42779?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-42779?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Apache mina
BranchAffectedFixed in
2.2≥ 2.2.0, < 2.2.72.2.7
2.1≥ 2.1.0, < 2.1.122.1.12

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2026:60259 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.

  • RHSA-2026:60256 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.22 security update.

  • RHSA-2026:60254 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.

  • RHSA-2026:60252 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.

  • RHSA-2026:60251 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.16 security update.

  • RHSA-2026:60250 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.18 security update.

5 more advisories

Full record on NVD

Fix

  1. Update Apache mina to 2.2.7 · 2.1.12
  2. Vendor fix Red Hat Product Security RHSA-2026:60259 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.20 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.
  3. Vendor fix Red Hat Product Security RHSA-2026:60256 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.22 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.
  4. Vendor fix Red Hat Product Security RHSA-2026:60254 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.21 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.
  5. Vendor fix Red Hat Product Security RHSA-2026:60252 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.19 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.
  6. Vendor fix Red Hat Product Security RHSA-2026:60251 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.16 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.
  7. Vendor fix Red Hat Product Security RHSA-2026:60250 · 4 productsIt is recommended that existing users of Red Hat OpenShift Developer Tools - OpenShift Jenkins 4.18 upgrade to the latest. This image uses java-21-openjdk as the default JDK. java-25-openjdk is available in rhel9 images. java-17-openjdk is removed.

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifieddinosn/CVE-2026-42779
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-05-01
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.19.8read 2026-10-23
  • CNAweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score0.8 %2026-10-23
  • PoC-in-GitHubproof of concept1read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-05-01
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-42779?

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.

Is CVE-2026-42779 actively exploited?

Active exploitation of CVE-2026-42779 has not been confirmed. Its EPSS score was 0.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-42779?

CVE-2026-42779 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database