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CVE-2026-77638

Estado: AnalizadaCrítica (9)—

Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach.

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.

AV:N sin requerimientos previos permite explotar red pública (T1190). La condición de carrera en Tor permite suplantación del servicio onion (MITM/T1557) y potencial alteración de datos en tránsito (T1565.002).

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

Network SegmentationLimit Access to Resource Over NetworkFilter Network TrafficEncrypt Sensitive InformationVulnerability ScanningUser Training

Tecnologías afectadas (1)

Torproject — TOR

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-77638",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-77638",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-27T15:44:49.153588Z"
        }
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  "published": "2026-08-20T21:17:11.097",
  "references": [
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      "tags": [
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        "Release Notes",
        "Vendor Advisory"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-362"
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      "value": "Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach."
    }
  ],
  "lastModified": "2026-09-16T14:08:23.407",
  "configurations": [
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          "cpeMatch": [
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  "sourceIdentifier": "cve@mitre.org"
}