Security advisory

{
  "id": "6f6752f1aa58c7de0ef37de6ced957236cc451d4d2a7662b26204d65aa0def50",
  "url": "https://osv.dev/vulnerability/CVE-2021-4076",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-4076",
    "summary": "A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.",
    "evidence": "osv:CVE-2021-4076",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-4076",
      "aliases": [
        "CVE-2021-4076"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/latchset/tang",
              "type": "GIT",
              "events": [
                {
                  "introduced": "95d482256f2d44bd6819df4e41a278937a9827b5"
                },
                {
                  "fixed": "e2059ee1109510a7c14b099af7dcd8631e598270"
                },
                {
                  "fixed": "e82459fda10f0630c3414ed2afbc6320bb9ea7c9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tang_project:tang:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8"
                      },
                      {
                        "fixed": "11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e82459fda10f0630c3414ed2afbc6320bb9ea7c9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v10",
            "v9",
            "v8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4076.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-4076-19664f9a",
                "digest": {
                  "threshold": 0.9,
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                },
                "source": "https://github.com/latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9",
                "target": {
                  "file": "src/keys.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
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              {
                "id": "CVE-2021-4076-c012c8ad",
                "digest": {
                  "length": 815,
                  "function_hash": "136612934161186189206674997866259629427"
                },
                "source": "https://github.com/latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9",
                "target": {
                  "file": "src/keys.c",
                  "function": "find_by_thp"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
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                "id": "CVE-2021-4076-f7dd0136",
                "digest": {
                  "length": 277,
                  "function_hash": "149967995752714570335066650740858870954"
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                "source": "https://github.com/latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9",
                "target": {
                  "file": "src/keys.c",
                  "function": "find_jws"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
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            "vanir_signatures_modified": "2026-10-20T14:29:23Z"
          }
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      ],
      "modified": "2026-10-20T14:29:23.616235976Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=2029814",
        "https://github.com/latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9",
        "https://github.com/latchset/tang/pull/81"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-4076",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 389068,
  "published_at": "2022-03-02T23:15:09.187+00:00"
}