CVE-2026-77423

{
  "etk_id": "ETK-2026-30",
  "cve_id": "CVE-2026-77423",
  "display_id": "CVE-2026-77423",
  "ghsa_id": "GHSA-2v9w-34q6-wpqx",
  "euvd_id": "EUVD-2026-85531",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Regular expression denial of service in JLine builtins less pager",
  "summary": "JLine builtins versions before 3.30.15 and 4.3.1 process user-provided `less` search and display-filter patterns with an unbounded backtracking regular-expression engine. An attacker who can provide these patterns can consume CPU and block a session thread; repeated use can exhaust bounded session pools in exposed Telnet or SSH deployments.",
  "mitigation": "Upgrade `org.jline:jline-builtins` to version 3.30.15 or 4.3.1. Until upgraded, do not expose the `less` viewer to untrusted users, or restrict user-controlled search and display-filter patterns.",
  "vendor": "maven",
  "product": "maven:org.jline:jline-builtins",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 4.3.1"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.3.1"
      ],
      "package_name": "org.jline:jline-builtins",
      "purl": "pkg:maven/org.jline/jline-builtins"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0, < 3.30.15"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "3.30.15"
      ],
      "package_name": "org.jline:jline-builtins",
      "purl": "pkg:maven/org.jline/jline-builtins"
    }
  ],
  "cwes": [
    1333
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0039,
  "epss_percentile": 0.3109,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 24.087939283333334,
  "t0_at": "2026-09-23T18:17:49.635000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-06-30T20:15:26+00:00",
      "days": -84.9183291087963,
      "is_lower_bound": false,
      "measured_at": "2026-09-23T18:17:49.635000+00:00",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"
    },
    "trigger_signal": {
      "at": "2026-09-23T18:17:49.635000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-23T18:17:49.635000+00:00",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"
    }
  }
}