Unrated

DEBIAN-CVE-2026-86231

Type: advisorySource: OSV1 source record

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.

Announced 6 Sept 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-86231

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-86231

jsch

Source reference: /affected/0/package/name

Affected versions: 0.1.55-1
Source reference: /affected/0/versions
0.1.55-2
Source reference: /affected/0/versions
0.2.19-1
Source reference: /affected/0/versions
0.2.19-1~exp0
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jsch

Source reference: /affected/1/package/name

Affected versions: 0.2.19-1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jsch

Source reference: /affected/2/package/name

Affected versions: 0.2.19-1
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jsch",
      "purl": "pkg:deb/debian/jsch?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.1.55-1",
      "0.1.55-2",
      "0.2.19-1",
      "0.2.19-1~exp0"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86231.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jsch",
      "purl": "pkg:deb/debian/jsch?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.2.19-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86231.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jsch",
      "purl": "pkg:deb/debian/jsch?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.2.19-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86231.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58243 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:49:21 GMT
Publisher date: Sun, 06 Sep 2026 23:17:39 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-86231 · Revision 1Source updated