CVE-2026-86231: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-x2rp-h5qg-fmqg
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CVSS 3.7
CWE-298
Published
Advisory Summary

CVE-2026-86231 is a LOW (CVSS 3.7) security vulnerability vulnerability (CWE-298: Improper Validation of Certificate Expiration) affecting Software libraries in the Maven ecosystem. The weakness occurs when a certificate expiration is not validated or is incorrectly validated.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86231 at a Glance

CVE Identifier CVE-2026-86231
GHSA Identifier GHSA-x2rp-h5qg-fmqg
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-298: Improper Validation of Certificate Expiration
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-86231

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-86231, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-298: Improper Validation of Certificate Expiration, where a certificate expiration is not validated or is incorrectly validated. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component.

References

NVD — CVE-2026-86231 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86231
Software Source Repository REPOSITORY
https://github.com/mwiede/jsch/issues/1091
Software Source Repository REPOSITORY
https://github.com/mwiede/jsch/pull/1098
Security Fix Commit FIX COMMIT
https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23
Software Source Repository REPOSITORY
https://github.com/mwiede/jsch
Software Release RELEASE
https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6
vuldb.com/cve/cve-2026-86231 WEB
https://vuldb.com/cve/CVE-2026-86231
vuldb.com/submit/898485 WEB
https://vuldb.com/submit/898485
vuldb.com/vuln/399388 WEB
https://vuldb.com/vuln/399388
vuldb.com/vuln/399388/cti WEB
https://vuldb.com/vuln/399388/cti

Frequently Asked Questions

What is CVE-2026-86231?
CVE-2026-86231 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-298: Improper Validation of Certificate Expiration.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86231?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-86231?
CVE-2026-86231 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-86231?
CVE-2026-86231 is classified under CWE-298: Improper Validation of Certificate Expiration (A certificate expiration is not validated or is incorrectly validated.).
How can I check Maven dependencies for CVE-2026-86231?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-x2rp-h5qg-fmqg",
  "modified" : "2026-09-07T00:30:20Z",
  "published" : "2026-09-07T00:30:20Z",
  "aliases" : [ "CVE-2026-86231" ],
  "details" : "A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86231"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mwiede/jsch/issues/1091"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mwiede/jsch/pull/1098"
  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://github.com/mwiede/jsch"
  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-86231"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/898485"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/399388"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/399388/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-298" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-06T23:17:39Z"
  }
}