Unrated

DEBIAN-CVE-2026-56741

Type: advisorySource: OSV1 source record

JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.

Announced 17 Jul 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-56741

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-2026-56741

jline

Source reference: /affected/0/package/name

Affected versions: 1.0-3
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline

Source reference: /affected/1/package/name

Affected versions: 1.0-3
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline

Source reference: /affected/2/package/name

Affected versions: 1.0-3
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline2

Source reference: /affected/3/package/name

Affected versions: 2.14.6-5
Source reference: /affected/3/versions
2.14.6-6
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline2

Source reference: /affected/4/package/name

Affected versions: 2.14.6-6
Source reference: /affected/4/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline2

Source reference: /affected/5/package/name

Affected versions: 2.14.6-6
Source reference: /affected/5/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline3

Source reference: /affected/6/package/name

Affected versions: 3.3.1-3
Source reference: /affected/6/versions
3.3.1-4
Source reference: /affected/6/versions
3.3.1-5
Source reference: /affected/6/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline3

Source reference: /affected/7/package/name

Affected versions: 3.3.1-4
Source reference: /affected/7/versions
3.3.1-5
Source reference: /affected/7/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline3

Source reference: /affected/8/package/name

Affected versions: 3.3.1-4
Source reference: /affected/8/versions
3.3.1-5
Source reference: /affected/8/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": "jline",
      "purl": "pkg:deb/debian/jline?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
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    ],
    "package": {
      "name": "jline",
      "purl": "pkg:deb/debian/jline?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
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      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
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    },
    "versions": [
      "2.14.6-5",
      "2.14.6-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
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        "events": [
          {
            "introduced": "0"
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    "package": {
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      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.14.6-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
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          }
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    "package": {
      "name": "jline2",
      "purl": "pkg:deb/debian/jline2?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.14.6-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.3.1-3",
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
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    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
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    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56741.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #57960 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:33:21 GMT
Publisher date: Fri, 17 Jul 2026 22:17:57 GMT

Read the original announcement