CVE-2026-22705

// CVE-2026-22705 PoC - Timing Side-Channel Attack on ML-DSA Signing // This PoC demonstrates timing analysis to detect the vulnerability import time import statistics from signatures import ML_DSA def measure_signing_time(private_key, message, iterations=1000): """Measure signing time variations to detect side-channel leak""" times = [] for i in range(iterations): start = time.perf_counter_ns() signature = private_key.sign(message) end = time.perf_counter_ns() times.append(end - start) return times def analyze_timing_pattern(times): """Analyze timing data for patterns indicating side-channel vulnerability""" mean = statistics.mean(times) stdev = statistics.stdev(times) variance_coefficient = stdev / mean # High variance coefficient indicates timing leak if variance_coefficient > 0.05: return True, f"Potential timing leak detected (CV={variance_coefficient:.4f})" return False, f"Timing appears constant (CV={variance_coefficient:.4f})" def main(): # Generate key pair params = ML_DSA.parameters(44) # ML-DSA-44 private_key = params.generate_key() message = b"Test message for timing analysis" # Collect timing data print("Collecting timing data...") times = measure_signing_time(private_key, message, iterations=1000) # Analyze results is_vulnerable, analysis = analyze_timing_pattern(times) print(f"Analysis result: {analysis}") if is_vulnerable: print("[✗] VULNERABLE: Timing side-channel detected") print("[!] Upgrade to RustCrypto Signatures >= 0.1.0-rc.2") else: print("[+] SECURE: No significant timing leak detected") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2026-22705", "sourceIdentifier": "[email protected]", "published": "2026-01-10T07:16:03.363", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "RustCrypto: Signatures offers support for digital signatures, which provide authentication of data using public-key cryptography. Prior to version 0.1.0-rc.2, a timing side-channel was discovered in the Decompose algorithm which is used during ML-DSA signing to generate hints for the signature. This issue has been patched in version 0.1.0-rc.2."}, {"lang": "es", "value": "RustCrypto: Signatures ofrece soporte para firmas digitales, que proporcionan autenticación de datos utilizando criptografía de clave pública. Antes de la versión 0.1.0-rc.2, se descubrió un canal lateral de temporización en el algoritmo Decompose que se utiliza durante la firma ML-DSA para generar pistas para la firma. Este problema ha sido parcheado en la versión 0.1.0-rc.2."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.2, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1240"}]}], "references": [{"url": "https://github.com/RustCrypto/signatures/commit/035d9eef98486ecd00a8bf418c7817eb14dd6558", "source": "[email protected]"}, {"url": "https://github.com/RustCrypto/signatures/pull/1144", "source": "[email protected]"}, {"url": "https://github.com/RustCrypto/signatures/security/advisories/GHSA-hcp2-x6j4-29j7", "source": "[email protected]"}]}}