CVE-2026-34063

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{"affected": [{"affectedData": [{"product": "network-libp2p", "vendor": "nimiq", "versions": [{"status": "affected", "version": "< 1.3.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*", "matchCriteriaId": "CD0CAAD1-7626-4A4A-A6F8-9DC46FE50731", "versionEndExcluding": "1.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Nimiq's network-libp2p is a Nimiq network implementation based on libp2p. Prior to version 1.3.0, `network-libp2p` discovery uses a libp2p `ConnectionHandler` state machine. the handler assumes there is at most one inbound and one outbound discovery substream per connection. if a remote peer opens/negotiate the discovery protocol substream a second time on the same connection, the handler hits a `panic!(\\\"Inbound already connected\\\")` / `panic!(\\\"Outbound already connected\\\")` path instead of failing closed. This causes a remote crash of the networking task (swarm), taking the node's p2p networking offline until restart. The patch for this vulnerability is formally released as part of v1.3.0. No known workarounds are available."}, {"lang": "es", "value": "El network-libp2p de Nimiq es una implementaci\u00f3n de red de Nimiq basada en libp2p. Antes de la versi\u00f3n 1.3.0, el descubrimiento de \u201cnetwork-libp2p\u201d utiliza una m\u00e1quina de estados \u201cConnectionHandler\u201d de libp2p. El gestor asume que hay como m\u00e1ximo un subflujo de descubrimiento entrante y uno saliente por conexi\u00f3n. Si un par remoto abre/negocia el subflujo del protocolo de descubrimiento una segunda vez en la misma conexi\u00f3n, el gestor alcanza una ruta \u201cpanic!(\u2019Inbound already connected\u2019)\u201d / \u201cpanic!(\u2019Outbound already connected\u2019)\u201d en lugar de fallar de forma controlada. Esto provoca un fallo remoto de la tarea de red (swarm), dejando la red p2p del nodo fuera de l\u00ednea hasta el reinicio. El parche para esta vulnerabilidad se publica formalmente como parte de la v1.3.0. No se conocen soluciones alternativas disponibles."}], "id": "CVE-2026-34063", "lastModified": "2026-10-26T22:10:00.163", "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-2026-34063", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-23T13:51:51.197194Z", "version": "2.0.3"}}]}, "published": "2026-04-22T20:16:40.713", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nimiq/core-rs-albatross/commit/e0d4e01994f061bf41d3c2835bc74040d3c084f5"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/nimiq/core-rs-albatross/pull/3666"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-74hp-mhfx-m45h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "network-libp2p", "source": "cna", "vendor": "nimiq"}, "product": "network-libp2p", "vendor": "nimiq"}], "analysis": {"en": {"generated_at": "2026-04-28T15:18:00.046473+00:00", "value": {"mitigation_remediation": ["Upgrade network-libp2p to version 1.3.0 or later, which contains the fix.", "Restart the node immediately if a crash occurs to restore p2p connectivity.", "Set up monitoring to detect connectivity loss or panic logs so that any recurrence is promptly addressed."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service on Node's P2P Networking"}, "threat_synthesis": {"affected_systems": "Nimiq network-libp2p versions before 1.3.0", "description_and_impact": "The vulnerability is in Nimiq's network-libp2p implementation, where the ConnectionHandler state machine mistakenly assumes there can be at most one inbound and one outbound discovery substream per connection. If a remote peer initiates the discovery protocol substream twice over the same connection, the handler fails by triggering a panic in the code paths \"Inbound already connected\" or \"Outbound already connected\". This panic brings down the networking task (swarm) and renders the node's peer\u2011to\u2011peer network unusable until a restart. The weakness is an unchecked panic condition, identified as CWE\u2011617.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity. An attacker can trigger the flaw from any remote peer capable of establishing a connection to the node, making it readily exploitable in open or untrusted networks. EPSS score indicates a very low exploitation probability (<1%), and the vulnerability is not listed in CISA's KEV catalog. By forcing a node into an offline state, an adversary can achieve a denial\u2011of\u2011service effect until the node is manually restarted."}}}}, "created": "2026-04-27T20:20:59.843335+00:00", "updated": "2026-04-28T15:30:34.814152+00:00", "vendors": ["nimiq", "nimiq$PRODUCT$network-libp2p"]}