CVE-2026-86231

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    CVE-2026-86231

    Published: 6 Sept 2026Last Modified: 19 Sept 2026

    Summary: mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation

    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.

    References: https://github.com/mwiede/jsch/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86231.json, https://nvd.nist.gov/vuln/detail/CVE-2026-86231, https://vuldb.com/cve/CVE-2026-86231, https://vuldb.com/submit/898485, https://vuldb.com/vuln/399388, https://github.com/mwiede/jsch/issues/1091, https://vuldb.com/vuln/399388/cti, https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23, https://github.com/mwiede/jsch/pull/1098, https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- f3e25918044a3ff072158839bc9b379d36e8e11d
    Fixed -194a2f76a5c0f1c3f778565be3fd66bcafc42d23

    Affected versions

    2.28.0
    2.28.1
    2.28.3
    2.28.4
    2.28.5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86231 | CVE-DB