{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-44519", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-06T18:28:20.888Z", "datePublished": "2026-11-06T21:22:27.624Z", "dateUpdated": "2026-11-06T21:22:27.624Z"}, "containers": {"cna": {"title": "liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others)", "problemTypes": [{"descriptions": [{"cweId": "CWE-385", "lang": "en", "description": "CWE-385: Covert Timing Channel", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-5c97-hp95-vg56", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-5c97-hp95-vg56"}, {"name": "https://github.com/open-quantum-safe/liboqs/pull/2431", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-quantum-safe/liboqs/pull/2431"}, {"name": "https://github.com/open-quantum-safe/liboqs/commit/d95fc734f5de9bdfc80c8c65d8166b30e9cff5cd", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-quantum-safe/liboqs/commit/d95fc734f5de9bdfc80c8c65d8166b30e9cff5cd"}, {"name": "https://github.com/open-quantum-safe/liboqs/releases/tag/0.16.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/open-quantum-safe/liboqs/releases/tag/0.16.0"}], "affected": [{"vendor": "open-quantum-safe", "product": "liboqs", "versions": [{"version": "< 0.16.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-06T21:22:27.624Z"}, "descriptions": [{"lang": "en", "value": "liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, the ct_select function in src/kem/frodokem/external/util.c for the FrodoKEM-640, FrodoKEM-976, and FrodoKEM-1344 AES and SHAKE reference variants lacks a value barrier in the Fujisaki-Okamoto implicit-rejection path. When compiled with Clang 17 or later at an affected optimization level such as -Os, the compiler can emit a secret-dependent conditional load, causing the real and rejection secret paths to leave distinguishable cache residency after successful and failed decapsulation. A local attacker able to perform repeated cache-timing measurements may use this oracle as part of a private-key recovery attack. Default -O3 builds vectorize both source loads and do not exhibit the reported behavior, and the advisory does not report the same generated memory-access pattern in NTRU, NTRU-Prime, BIKE, HQC, Classic McEliece, Kyber, or the already-barriered ML-KEM implementation. This issue is fixed in version 0.16.0."}], "source": {"advisory": "GHSA-5c97-hp95-vg56", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "liboqs", "vendor": "open-quantum-safe", "versions": [{"status": "affected", "version": "< 0.16.0"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, the ct_select function in src/kem/frodokem/external/util.c for the FrodoKEM-640, FrodoKEM-976, and FrodoKEM-1344 AES and SHAKE reference variants lacks a value barrier in the Fujisaki-Okamoto implicit-rejection path. When compiled with Clang 17 or later at an affected optimization level such as -Os, the compiler can emit a secret-dependent conditional load, causing the real and rejection secret paths to leave distinguishable cache residency after successful and failed decapsulation. A local attacker able to perform repeated cache-timing measurements may use this oracle as part of a private-key recovery attack. Default -O3 builds vectorize both source loads and do not exhibit the reported behavior, and the advisory does not report the same generated memory-access pattern in NTRU, NTRU-Prime, BIKE, HQC, Classic McEliece, Kyber, or the already-barriered ML-KEM implementation. This issue is fixed in version 0.16.0."}], "id": "CVE-2026-44519", "lastModified": "2026-11-06T22:17:51.403", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.4, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-11-06T22:17:51.403", "references": [{"source": "[email protected]", "url": "https://github.com/open-quantum-safe/liboqs/commit/d95fc734f5de9bdfc80c8c65d8166b30e9cff5cd"}, {"source": "[email protected]", "url": "https://github.com/open-quantum-safe/liboqs/pull/2431"}, {"source": "[email protected]", "url": "https://github.com/open-quantum-safe/liboqs/releases/tag/0.16.0"}, {"source": "[email protected]", "url": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-5c97-hp95-vg56"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-385"}], "source": "[email protected]", "type": "Primary"}]}

{}