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CVE-2026-33040

Estado: AnalizadaAlta (8.7)—

libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication.

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Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3.

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.

Aplicación expuesta en red (AV:N, PR:N, UI:N) vulnerable a mensaje PRUNE malformado que causa pánico/DoS por desbordamiento aritmético en Duration/Instant, sin autenticación requerida.

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 ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Protocol — Libp2p-gossipsub

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-33040",
  "cveTags": [],
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          "id": "CVE-2026-33040",
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          "options": [
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              "exploitation": "none"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
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          "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",
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          "valueDensity": "NOT_DEFINED",
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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  "published": "2026-03-20T06:16:12.330",
  "references": [
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  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-190"
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      "lang": "en",
      "value": "libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication. Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3."
    },
    {
      "lang": "es",
      "value": "libp2p-rust es la implementación oficial en lenguaje Rust de la pila de red libp2p. En versiones anteriores a la 0.49.3, la implementación de Gossipsub acepta valores de retroceso PRUNE controlados por el atacante y puede realizar aritmética de tiempo sin verificar al almacenar el estado de retroceso. Un mensaje de control PRUNE especialmente diseñado con un retroceso extremadamente grande (p. ej., u64::MAX) puede provocar un desbordamiento de Duration/Instant durante la lógica de actualización del retroceso, desencadenando un pánico en la máquina de estados de la red. Esto es accesible remotamente a través de una conexión libp2p normal y no requiere autenticación. Cualquier aplicación que exponga un oyente Gossipsub de libp2p y que utilice la ruta de manejo de retroceso afectada puede ser bloqueada por un atacante de red que pueda alcanzar el puerto del servicio. El ataque puede repetirse reconectándose y reproduciendo el mensaje de control diseñado. Este problema ha sido solucionado en la versión 0.49.3."
    }
  ],
  "lastModified": "2026-06-17T10:36:51.167",
  "configurations": [
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      "nodes": [
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          "negate": false,
          "cpeMatch": [
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