CVE-2026-40092

/* * Conceptual PoC for CVE-2026-40092 * This demonstrates the condition causing the panic. */ fn main() { // Simulate the vulnerable code path // In the real vulnerability, this is triggered via a network DHT record let malicious_sig_length = 63; // Must not be 64 println!("Attempting to verify signature with length: {}", malicious_sig_length); // The vulnerable code uses .unwrap() on a conversion that fails // let sig = Ed25519Signature::from_bytes(&sig_bytes).unwrap(); // This simulates the panic: panic!("Simulated panic: Signature length is {}", malicious_sig_length); }

{"cve": {"id": "CVE-2026-40092", "sourceIdentifier": "[email protected]", "published": "2026-05-20T22:16:36.850", "lastModified": "2026-05-21T16:04:53.813", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned<ValidatorRecord, KeyPair> with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0."}], "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"}]}], "references": [{"url": "https://github.com/nimiq/core-rs-albatross/commit/807ee8e99a7ccdc604d49971f292854bfa36754d", "source": "[email protected]"}, {"url": "https://github.com/nimiq/core-rs-albatross/pull/3708", "source": "[email protected]"}, {"url": "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0", "source": "[email protected]"}, {"url": "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-27w2-87xv-37c6", "source": "[email protected]"}]}}