{"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"}}}}