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CVE-2026-77423

Estado: Pendiente de análisisAlta (7.5)—

JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector AV:N sin autenticación permite explotación remota de la aplicación expuesta (JLine). ReDoS con patrones regex anidados causa consumo excesivo de CPU y bloqueo de sesiones (DoS aplicación). En entornos Telnet/SSH múltiples, agota recursos del pool.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningUser TrainingUser Account ManagementRestrict Web-Based ContentPrivileged Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Jline — JlineAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-77423",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77423",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-24T14:10:41.490849Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "jline",
          "product": "jline3",
          "versions": [
            {
              "status": "affected",
              "version": ">= 3.0.0, < 3.30.15"
            },
            {
              "status": "affected",
              "version": ">= 4.0.0, < 4.3.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-09-23T19:19:16.017",
  "references": [
    {
      "url": "https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/pull/2012",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/pull/2018",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/releases/tag/4.3.1",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/releases/tag/jline-3.30.15",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1."
    }
  ],
  "lastModified": "2026-09-30T16:44:39.840",
  "sourceIdentifier": "security-advisories@github.com"
}