Github.com/supranational/blst: blst cryptographic library: denial of service via out-of-bounds stack write in key generation

{
  "id": "f787ae1d75afd5aa1ddbd86c73501d235bdc5bffb3af86f61afbf5cb87ea2ada",
  "url": "https://osv.dev/vulnerability/CVE-2026-2681",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Github.com/supranational/blst: blst cryptographic library: denial of service via out-of-bounds stack write in key generation",
    "summary": "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.",
    "evidence": "osv:CVE-2026-2681",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-2681",
      "aliases": [
        "CVE-2026-2681"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/supranational/blst",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "e7f90de551e8df682f3cc99067d204d8b90d27ad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.3.16"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "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"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.328763456Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/security/cve/CVE-2026-2681",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2681.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-2681",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2440580",
        "https://github.com/supranational/blst"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "fedora",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2681.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-2681",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519821,
  "published_at": "2026-02-19T06:58:47.09+00:00"
}