{"id":"CVE-2026-2681","summary":"Github.com/supranational/blst: blst cryptographic library: denial of service via out-of-bounds stack write in key generation","details":"A flaw was found in the blst cryptographic library. This out-of-bounds stack write vulnerability, specifically in the blst_sha256_bcopy assembly routine, occurs due to a missing zero-length guard. A remote attacker can exploit this by providing a zero-length salt parameter to key generation functions, such as blst_keygen_v5(), if the application exposes this functionality. Successful exploitation leads to memory corruption and immediate process termination, resulting in a denial-of-service (DoS) condition.","modified":"2026-07-08T08:12:41.297202841Z","published":"2026-02-19T06:58:47.090Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2681.json","cna_assigner":"fedora","cwe_ids":["CWE-787"]},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-2681"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2681.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2681"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2440580"},{"type":"PACKAGE","url":"https://github.com/supranational/blst"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/supranational/blst","events":[{"introduced":"0"},{"last_affected":"e7f90de551e8df682f3cc99067d204d8b90d27ad"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"0.3.16"}]}}],"versions":["v0.3.16","v0.3.15","v0.3.14","v0.3.13","v0.3.12","v0.3.11","v0.3.10","v0.3.8","v0.3.7","v0.3.6","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.2-alpha.1","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2681.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}