CVE-2026-52878

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{"affected": [{"affectedData": [{"product": "klever-go", "vendor": "klever-io", "versions": [{"status": "affected", "version": ">= 1.7.14, < 1.7.18"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Klever-Go is the Go implementation of the Klever blockchain protocol. Versions 1.7.14 through 1.7.17 are vulnerable to a nil-pointer panic triggered by a protobuf Transaction whose embedded RawData sub-message is omitted. This omission causes RawData to decode to nil. Every transaction gossiped on the Klever-Go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback, where txVersionChecker.CheckTxVersion dereferences tx.RawData.Version with no nil check. Because the libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and Klever's own network/p2p layer install no recover(), the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required, and delivery aimed at enough of the BLS validator set can halt block production, resulting in a chain halt. This issue has been fixed in version 1.7.18."}, {"lang": "es", "value": "Klever-Go es la implementaci\u00f3n en Go del protocolo de cadena de bloques Klever. Las versiones 1.7.14 a la 1.7.17 son vulnerables a un p\u00e1nico por puntero nulo provocado por una transacci\u00f3n protobuf cuyo submensaje RawData incrustado se omite. Esta omisi\u00f3n hace que RawData se decodifique como nulo. Cada transacci\u00f3n difundida en la red P2P de Klever-Go se decodifica y valida sincr\u00f3nicamente dentro de la devoluci\u00f3n de llamada del validador de temas de libp2p pubsub, donde txVersionChecker.CheckTxVersion desreferencia tx.RawData.Version sin una comprobaci\u00f3n de nulo. Debido a que la devoluci\u00f3n de llamada de libp2p pubsub, el trabajador de validaci\u00f3n subyacente de go-libp2p-pubsub y la propia capa de red/P2P de Klever no instalan ning\u00fan recover(), el p\u00e1nico se propaga y bloquea todo el proceso del nodo. La carga \u00fatil del atacante es un mensaje protobuf de 3 bytes; no se requiere clave de validador, participaci\u00f3n, fondos o cuenta en cadena, y la entrega dirigida a una cantidad suficiente del conjunto de validadores BLS puede detener la producci\u00f3n de bloques, lo que resulta en una detenci\u00f3n de la cadena. Este problema ha sido solucionado en la versi\u00f3n 1.7.18."}], "id": "CVE-2026-52878", "lastModified": "2026-10-24T16:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "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", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52878", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-10T14:09:10.957245Z", "version": "2.0.3"}}]}, "published": "2026-08-07T23:17:04.593", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/klever-io/klever-go/releases/tag/v1.7.18"}, {"source": "security-advisories@github.com", "url": "https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.7.14,1.7.18)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "klever-go", "source": "cna", "vendor": "klever-io"}, "product": "klever-go", "vendor": "klever-io"}], "created": "2026-08-08T00:00:04.395669+00:00", "updated": "2026-08-08T00:00:04.761910+00:00", "vendors": ["klever-io", "klever-io$PRODUCT$klever-go"]}