CVE-2026-33040

{"id": "CVE-2026-33040", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "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}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-20T06:16:12.330", "references": [{"url": "https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-gc42-3jg7-rxr2", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-190"}]}], "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."}], "lastModified": "2026-03-23T16:17:17.450", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:protocol:libp2p:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "E7B5CC8F-4264-4A6E-81A1-44400AD4D0AE", "versionEndExcluding": "0.49.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}