{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "liboqs",
          "vendor": "open-quantum-safe",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.16.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-385",
              "description": "CWE-385: Covert Timing Channel",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-06T21:22:27.624Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-5c97-hp95-vg56",
        "discovery": "UNKNOWN"
      },
      "title": "liboqs: Missing value barrier in FO implicit rejection path (FrodoKEM, NTRU, and others)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44519",
    "datePublished": "2026-11-06T21:22:27.624Z",
    "dateReserved": "2026-05-06T18:28:20.888Z",
    "dateUpdated": "2026-11-06T21:22:27.624Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}