CVE catalog

CVE-2026-86231

A security flaw has been discovered in mwiede jsch up…

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: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Sep 6, 2026, 11:17:00 PM UTC
Updated: Sep 6, 2026, 11:17:39 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.42% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "jsch",
      "status": "vulnerable",
      "release": "sid",
      "version": "0.2.19-1"
    },
    {
      "name": "jsch",
      "status": "vulnerable",
      "release": "forky",
      "version": "0.2.19-1"
    },
    {
      "name": "jsch",
      "status": "vulnerable",
      "release": "trixie",
      "version": "0.2.19-1"
    },
    {
      "name": "jsch",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "0.1.55-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "jsch",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jsch",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jsch",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "jsch",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "jsch",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.28.7-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "2.28.7-1.1",
      "provider_record_id": "OPENSUSE-SU-2026:11814-1"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "14.04",
      "versions": [
        "0.1.48-0ubuntu1",
        "0.1.50-1ubuntu1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "0.1.53-1ubuntu1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "0.1.54-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "0.1.55-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "0.1.55-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "0.1.55-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.10",
      "versions": [
        "0.2.19-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    },
    {
      "name": "jsch",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "0.2.19-1",
        "0.2.19-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-86231"
    }
  ]
}

Publisher notes

[trixie] jsch: Minor issue [bookworm] jsch: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libjsch-java]Unknown
Source package: [jsch]
Details (2)
- 0.1.55-1 · all · bookworm
  Affected
  nvd · jsch · debian · bookworm; nvd · jsch · debian · 12
- 0.1.55-1 · all · bookworm
  Affected
  nvd · jsch · debian · bookworm; nvd · jsch · debian · 12
[libjsch-java-doc]Unknown
Source package: [jsch]
Details (2)
- 0.1.55-1 · all · bookworm
  Affected
  nvd · jsch · debian · bookworm; nvd · jsch · debian · 12
- 0.1.55-1 · all · bookworm
  Affected
  nvd · jsch · debian · bookworm; nvd · jsch · debian · 12

[Debian 13 (Trixie)]

[libjsch-java]Unknown
Source package: [jsch]
Details (2)
- 0.2.19-1 · all · trixie
  Affected
  nvd · jsch · debian · 13
- 0.2.19-1 · all · trixie
  Affected
  nvd · jsch · debian · 13

[openSUSE Tumbleweed]

[jsch]Unknown
Source package: [jsch]
Details (1)
- 0.2.22-1.6 · noarch · tumbleweed
  Affected · Fixed: 2.28.7-1.1
  nvd · jsch · opensuse · tumbleweed
[jsch-demo]Unknown
Source package: [jsch]
Details (1)
- 0.2.22-1.6 · noarch · tumbleweed
  Unknown · Fixed: 2.28.7-1.1
  Version impact unknown
  nvd · jsch · opensuse · tumbleweed
[jsch-javadoc]Unknown
Source package: [jsch]
Details (1)
- 0.2.22-1.6 · noarch · tumbleweed
  Unknown · Fixed: 2.28.7-1.1
  Version impact unknown
  nvd · jsch · opensuse · tumbleweed

Observed: Oct 25, 2026, 6:46:21 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]