Unrated

DEBIAN-CVE-2026-56740

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 limit the number of environment variables a client may inject via the Telnet NEW-ENVIRON option, and TelnetIO.readNEVariables() in TelnetIO.java:1127-1180 stores each variable pair in a HashMap held by ConnectionData, allowing an unauthenticated attacker to flood unique variable pairs before the terminating IAC SE byte and exhaust JVM heap memory with an OutOfMemoryError. 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-2026-56740

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-2026-56740

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-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "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-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
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        "events": [
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      "name": "jline",
      "purl": "pkg:deb/debian/jline?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
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        "events": [
          {
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          }
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    ],
    "package": {
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      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.14.6-5",
      "2.14.6-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
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  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "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-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
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      {
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        "events": [
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      "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-2026-56740.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-2026-56740.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-2026-56740.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-2026-56740.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #56056 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:20:20 GMT
Publisher date: Fri, 17 Jul 2026 22:17:57 GMT

Read the original announcement