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    4 vulnerabilities found for jline3 by jline

    CVE-2026-56741 (GCVE-0-2026-56741)

    Vulnerability from nvd – Published: 2026-07-17 21:15 – Updated: 2026-07-20 15:21
    VLAI
    Title
    JLine: Unauthenticated Remote DoS via Unbounded Telnet NAWS Terminal Geometry
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    jline jline3 Affected: < 3.30.14
    Affected: >= 4.0.0, < 4.0.16
    Affected: >= 4.1.0, < 4.2.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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            "url": "https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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        {
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          "vendor": "jline",
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        }
      ],
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          "url": "https://github.com/jline/jline3/commit/733eb353dca7b0ea0252e724445b6defa29c393e"
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      "source": {
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      "title": "JLine: Unauthenticated Remote DoS via Unbounded Telnet NAWS Terminal Geometry"
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}

    CVE-2026-56740 (GCVE-0-2026-56740)

    Vulnerability from nvd – Published: 2026-07-17 21:17 – Updated: 2026-07-20 13:58
    VLAI
    Title
    JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    jline jline3 Affected: < 3.30.14
    Affected: >= 4.0.0, < 4.0.16
    Affected: >= 4.1.0, < 4.2.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
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    ],
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    CVE-2026-56740 (GCVE-0-2026-56740)

    Vulnerability from cvelistv5 – Published: 2026-07-17 21:17 – Updated: 2026-07-20 13:58
    VLAI
    Title
    JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    jline jline3 Affected: < 3.30.14
    Affected: >= 4.0.0, < 4.0.16
    Affected: >= 4.1.0, < 4.2.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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            "x_refsource_MISC"
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        "discovery": "UNKNOWN"
      },
      "title": "JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-56740",
    "datePublished": "2026-07-17T21:17:03.239Z",
    "dateReserved": "2026-06-22T19:17:28.959Z",
    "dateUpdated": "2026-07-20T13:58:00.902Z",
    "state": "PUBLISHED"
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    CVE-2026-56741 (GCVE-0-2026-56741)

    Vulnerability from cvelistv5 – Published: 2026-07-17 21:15 – Updated: 2026-07-20 15:21
    VLAI
    Title
    JLine: Unauthenticated Remote DoS via Unbounded Telnet NAWS Terminal Geometry
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    jline jline3 Affected: < 3.30.14
    Affected: >= 4.0.0, < 4.0.16
    Affected: >= 4.1.0, < 4.2.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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                "id": "CVE-2026-56741",
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                "timestamp": "2026-07-20T15:21:00.621662Z",
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        "title": "CISA ADP Vulnrichment"
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          "versions": [
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        }
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            "baseScore": 7.5,
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
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