Security advisory

{
  "id": "c1f7784c43586fa9932339f40c434616a492db1eef171296e8da242c7e96a435",
  "url": "https://osv.dev/vulnerability/CVE-2021-29521",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-29521",
    "summary": "TensorFlow is an end-to-end open source platform for machine learning. Specifying a negative dense shape in `tf.raw_ops.SparseCountSparseOutput` results in a segmentation fault being thrown out from the standard library as `std::vector` invariants are broken. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/8f7b60ee8c0206a2c99802e3a4d1bb55d2bc0624/tensorflow/core/kernels/count_ops.cc#L199-L213) assumes the first element of the dense shape is always positive and uses it to initialize a `BatchedMap` (i.e., `std::vector>`(https://github.com/tensorflow/tensorflow/blob/8f7b60ee8c0206a2c99802e3a4d1bb55d2bc0624/tensorflow/core/kernels/count_ops.cc#L27)) data structure. If the `shape` tensor has more than one element, `num_batches` is the first value in `shape`. Ensuring that the `dense_shape` argument is a valid tensor shape (that is, all elements are non-negative) solves this issue. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2 and TensorFlow 2.3.3.",
    "evidence": "osv:CVE-2021-29521",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-29521",
      "aliases": [
        "BIT-tensorflow-2021-29521",
        "CVE-2021-29521",
        "GHSA-hr84-fqvp-48mm",
        "PYSEC-2021-158",
        "PYSEC-2021-449",
        "PYSEC-2021-647"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tensorflow/tensorflow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b36436b087bd8e8701ef51718179037cccdfc26e"
                },
                {
                  "fixed": "3929ffacfbef7c431e8397920d040aaf47acff19"
                },
                {
                  "introduced": "582c8d236cb079023657287c318ff26adb239002"
                },
                {
                  "fixed": "1923123d32ea41d92b70a27a3f6ecf0763b56f6c"
                },
                {
                  "fixed": "c57c0b9f3a4f8684f3489dd9a9ec627ad8b599f5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.3.0"
                      },
                      {
                        "fixed": "2.3.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.4.0"
                      },
                      {
                        "fixed": "2.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c57c0b9f3a4f8684f3489dd9a9ec627ad8b599f5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.3.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29521.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-29521-f54e40af",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                },
                "source": "https://github.com/tensorflow/tensorflow/commit/c57c0b9f3a4f8684f3489dd9a9ec627ad8b599f5",
                "target": {
                  "file": "tensorflow/core/kernels/count_ops.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
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            ],
            "vanir_signatures_modified": "2026-10-20T14:20:37Z"
          }
        }
      ],
      "modified": "2026-10-20T14:20:37.550215575Z",
      "provider": "osv",
      "references": [
        "https://github.com/tensorflow/tensorflow/commit/c57c0b9f3a4f8684f3489dd9a9ec627ad8b599f5",
        "https://github.com/tensorflow/tensorflow/security/advisories/GHSA-hr84-fqvp-48mm"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-29521",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388826,
  "published_at": "2021-05-14T20:15:11.567+00:00"
}