FKIE_CVE-2026-33040

Vulnerability from fkie_nvd - Published: 2026-03-20 06:16 - Updated: 2026-03-23 16:17
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/libp2p/rust-libp2p/security/advisories/GHSA-gc42-3jg7-rxr2Vendor Advisory
Impacted products
Vendor Product Version
protocol libp2p *
To clipboard 

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              "matchCriteriaId": "E7B5CC8F-4264-4A6E-81A1-44400AD4D0AE",
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  "cveTags": [],
  "descriptions": [
    {
      "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 implementaci\u00f3n oficial en lenguaje Rust de la pila de red libp2p. En versiones anteriores a la 0.49.3, la implementaci\u00f3n de Gossipsub acepta valores de retroceso PRUNE controlados por el atacante y puede realizar aritm\u00e9tica de tiempo sin verificar al almacenar el estado de retroceso. Un mensaje de control PRUNE especialmente dise\u00f1ado con un retroceso extremadamente grande (p. ej., u64::MAX) puede provocar un desbordamiento de Duration/Instant durante la l\u00f3gica de actualizaci\u00f3n del retroceso, desencadenando un p\u00e1nico en la m\u00e1quina de estados de la red. Esto es accesible remotamente a trav\u00e9s de una conexi\u00f3n libp2p normal y no requiere autenticaci\u00f3n. Cualquier aplicaci\u00f3n 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 reconect\u00e1ndose y reproduciendo el mensaje de control dise\u00f1ado. Este problema ha sido solucionado en la versi\u00f3n 0.49.3."
    }
  ],
  "id": "CVE-2026-33040",
  "lastModified": "2026-03-23T16:17:17.450",
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          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "Recovery": "NOT_DEFINED",
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          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
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          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "type": "Secondary"
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  "published": "2026-03-20T06:16:12.330",
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          "value": "CWE-190"
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}


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