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CVE-2026-34042

Estado: AplazadaAlta (8.2)—

act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86.

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.

Requiere UI:R (usuario abre/ejecuta act localmente). Impacto: acceso a caché malicioso con RCE en contenedor Docker; T1078 (acceso a recursos) + T1059 (ejecución de código).

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

Privileged Account ManagementApplication Developer GuidanceActive Directory ConfigurationUser TrainingUser Account ManagementRestrict Web-Based Content

Tecnologías afectadas (1)

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

ACT Project — ACTAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-34042",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34042",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-31T18:50:28.267177Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "nektos",
          "product": "act",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.2.86"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-31T03:15:58.220",
  "references": [
    {
      "url": "https://code.forgejo.org/forgejo/runner/issues/294",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/nektos/act/releases/tag/v0.2.86",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86."
    },
    {
      "lang": "es",
      "value": "act es un proyecto que permite la ejecución local de acciones de GitHub. Antes de la versión 0.2.86, el servidor actions/cache integrado de act escucha las conexiones en todas las interfaces y permite que cualquiera que pueda conectarse a él, incluyendo a alguien desde cualquier lugar de internet, cree cachés con claves arbitrarias y recupere todos los cachés existentes. Si pueden predecir qué claves de caché serán utilizadas por las acciones locales, pueden crear cachés maliciosos que contengan los archivos que deseen, lo que muy probablemente permitiría la ejecución remota de código arbitrario dentro del contenedor de Docker. Este problema ha sido parcheado en la versión 0.2.86."
    }
  ],
  "lastModified": "2026-06-17T10:38:28.640",
  "sourceIdentifier": "security-advisories@github.com"
}