{"schema_version":"1.9.0","id":"CVE-2023-1732","published":"2023-05-10T11:41:53.902Z","modified":"2026-08-12T03:51:15.315178120Z","aliases":["GHSA-2q89-485c-9j2x","GO-2023-1765"],"related":["CGA-vfrc-8hcx-ccqq","openSUSE-SU-2025:14663-1"],"summary":"Improper random reading in CIRCL","details":"When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret.\n\nThe tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.\n\n","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cloudflare/circl","events":[{"introduced":"0"},{"fixed":"3bef500f2b925f150815a360b90081021e082939"}],"database_specific":{"cpe":"cpe:2.3:a:cloudflare:circl:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"0"},{"fixed":"<1.3.3"},{"fixed":"1.3.3"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-1732.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1732.json"},{"type":"ADVISORY","url":"https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1732"},{"type":"PACKAGE","url":"https://github.com/cloudflare/circl"}],"database_specific":{"cna_assigner":"cloudflare","cwe_ids":["CWE-20","CWE-755"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1732.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N"}]}