{"id":"CVE-2024-36405","state":"PUBLISHED","title":"Control-flow timing leak in Kyber reference implementation when compiled with Clang 15-18 for -Os, -O1 and other options","description":"liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. A control-flow timing lean has been identified in the reference implementation of the Kyber key encapsulation mechanism when it is compiled with Clang 15-18 for `-Os`, `-O1`, and other compilation options. A proof-of-concept local attack on the reference implementation leaks the entire ML-KEM 512 secret key in ~10 minutes using end-to-end decapsulation timing measurements. The issue has been fixed in version 0.10.1. As a possible workaround, some compiler options may produce vectorized code that does not leak secret information, however relying on these compiler options as a workaround may not be reliable.","publishedAt":"2024-06-10T12:47:17.934Z","updatedAt":"2024-08-02T03:37:05.189Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["open-quantum-safe liboqs"],"affected":[{"vendor":"open-quantum-safe","product":"liboqs","versions":[{"version":"< 0.10.1","status":"affected"}]}],"references":["https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-f2v9-5498-2vpp","https://github.com/open-quantum-safe/liboqs/commit/982c762c242ef549c914891b47bf6e0ed6321f91","https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c","https://github.com/open-quantum-safe/liboqs/blob/7eecda6095c003ddded7175a1ffdf35a2ce63ed5/src/kem/kyber/pqcrystals-kyber_kyber512_ref/poly.c#L166"],"weaknesses":["CWE-208","CWE-385"],"ingestedAt":"2026-10-29T20:07:30.303Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/36xxx/CVE-2024-36405.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-36405","state":"PUBLISHED","datePublished":"2024-06-10T12:47:17.934Z","dateUpdated":"2024-08-02T03:37:05.189Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2024-05-27T15:59:57.031Z"},"containers":{"cna":{"title":"Control-flow timing leak in Kyber reference implementation when compiled with Clang 15-18 for -Os, -O1 and other options","descriptions":[{"lang":"en","value":"liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. A control-flow timing lean has been identified in the reference implementation of the Kyber key encapsulation mechanism when it is compiled with Clang 15-18 for `-Os`, `-O1`, and other compilation options. A proof-of-concept local attack on the reference implementation leaks the entire ML-KEM 512 secret key in ~10 minutes using end-to-end decapsulation timing measurements. The issue has been fixed in version 0.10.1. 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