{"items":[{"id":"NVI-00014180","kind":"vulnerability","title":"JLine3 Telnet server: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-47qp-hqvx-6r3f","CVE-2026-56740"],"plain_summary":"GitHub lists this reviewed advisory for org.jline:jline-remote-telnet, org.jline:jline-remote-telnet, org.jline:jline-remote-telnet. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-190cf97d43a350917ba28ee684ce46d7"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-01T21:03:14.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5605bda40c6e9ce16551b7d60299c81b"},{"kind":"CVSS","as_of":"2026-10-24T20:10:00.137Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-2bfb79d464fec076436c0a07969018e4"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.592%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.48359. Missing scores are unknown.","source_id":"sr-190cf97d43a350917ba28ee684ce46d7"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5605bda40c6e9ce16551b7d60299c81b","url":"https://github.com/advisories/GHSA-47qp-hqvx-6r3f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-47qp-hqvx-6r3f","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"},{"id":"sr-2bfb79d464fec076436c0a07969018e4","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56740","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-56740","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T01:48:33.286Z"},{"id":"sr-190cf97d43a350917ba28ee684ce46d7","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-56740","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.789Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.1.0, < 4.2.1"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.0.0, < 4.0.16"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":["< 3.30.14"]}],"null_published_at":"2026-11-08T19:53:44.043Z","source_updated_at":"2026-09-01T21:03:14.000Z","source_disclosed_at":"2026-06-18T13:07:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-02T02:21:50.763Z"},{"id":"NVI-00014180","kind":"vulnerability","title":"JLine3 Telnet server: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-47qp-hqvx-6r3f","CVE-2026-56740"],"plain_summary":"GitHub lists this reviewed advisory for org.jline:jline-remote-telnet, org.jline:jline-remote-telnet, org.jline:jline-remote-telnet. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-190cf97d43a350917ba28ee684ce46d7"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-01T21:03:14.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5605bda40c6e9ce16551b7d60299c81b"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.592%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.48359. Missing scores are unknown.","source_id":"sr-190cf97d43a350917ba28ee684ce46d7"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5605bda40c6e9ce16551b7d60299c81b","url":"https://github.com/advisories/GHSA-47qp-hqvx-6r3f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-47qp-hqvx-6r3f","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"},{"id":"sr-190cf97d43a350917ba28ee684ce46d7","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-56740","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.789Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.1.0, < 4.2.1"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.0.0, < 4.0.16"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":["< 3.30.14"]}],"null_published_at":"2026-11-07T14:01:55.384Z","source_updated_at":"2026-09-01T21:03:14.000Z","source_disclosed_at":"2026-06-18T13:07:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-02T02:21:50.763Z"},{"id":"NVI-00014180","kind":"vulnerability","title":"JLine3 Telnet server: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-47qp-hqvx-6r3f","CVE-2026-56740"],"plain_summary":"GitHub lists this reviewed advisory for org.jline:jline-remote-telnet, org.jline:jline-remote-telnet, org.jline:jline-remote-telnet. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-01T21:03:14.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5605bda40c6e9ce16551b7d60299c81b"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5605bda40c6e9ce16551b7d60299c81b","url":"https://github.com/advisories/GHSA-47qp-hqvx-6r3f","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-47qp-hqvx-6r3f","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.1.0, < 4.2.1"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":[">= 4.0.0, < 4.0.16"]},{"certainty":"source_listed","source_ids":["sr-5605bda40c6e9ce16551b7d60299c81b"],"technology":"org.jline:jline-remote-telnet","known_exclusions":[],"conditions_summary":"### Summary\n\nThe JLine3 Telnet server (`remote-telnet` module) does not limit the number of\nenvironment variables a client may inject via the Telnet NEW-ENVIRON option. An\nunauthenticated attacker can flood the server with a large number of unique\nvariable pairs before sending the terminating IAC SE byte, exhausting JVM heap\nmemory and causing an OutOfMemoryError (denial of service). Approximately 3–4 MB of\nnetwork traffic is sufficient to consume a 512 MB JVM heap.\n\n### Details\n\n`TelnetIO.readNEVariables()` (TelnetIO.java:1127-1180) processes incoming NEW-ENVIRON\nvariable pairs in a loop and stores each pair in a `HashMap` held by `ConnectionData`:\n\n```java\n// TelnetIO.java:1139-1178\nboolean cont = true;\nif (i == NE_VAR || i == NE_USERVAR) {\n    do {\n        switch (readNEVariableName(sbuf)) {\n            case NE_VAR_OK:\n                TelnetIO.this.connectionData.getEnvironment().put(str, sbuf.toString());\n                // ← no per-connection count limit\n                break;\n            case NE_VAR_UNDEFINED:\n                break; // cont remains true, loop continues\n        }\n    } while (cont);  // cont is never set to false; only exits via return\n}\n```\n\nThe variable accu","public_affected_ranges":["< 3.30.14"]}],"null_published_at":"2026-11-02T10:00:37.220Z","source_updated_at":"2026-09-01T21:03:14.000Z","source_disclosed_at":"2026-06-18T13:07:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:21:50.763Z"}],"next_cursor":null,"snapshot_revision":"42594"}