{"affected":[{"product":"liboqs","source":"CNA: GitHub_M","vendor":"open-quantum-safe","versions":[{"status":"affected","version":"< 0.16.0"}]}],"cveId":"CVE-2026-44519","cwes":["CWE-385"],"description":"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":5.1,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}],"modifiedAt":1794000147624,"publishedAt":1794000147624,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-5c97-hp95-vg56"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/open-quantum-safe/liboqs/pull/2431"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/open-quantum-safe/liboqs/commit/d95fc734f5de9bdfc80c8c65d8166b30e9cff5cd"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/open-quantum-safe/liboqs/releases/tag/0.16.0"}],"remediation":[],"revision":"b1509b369dd806b1c125e89226ec8af7bc805230cc504a8476eb8dd55dfa5463","sources":[{"modifiedAt":1794000147624,"name":"CNA: GitHub_M","retrievedAt":1794002927610,"url":"https://www.cve.org/CVERecord?id=CVE-2026-44519"}],"ssvc":null,"status":"published","title":"liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others)","updatedAt":1794002927610}