{"id":"CVE-2021-37692","aliases":["BIT-tensorflow-2021-37692","GHSA-cmgw-8vpc-rc59","PYSEC-2021-314","PYSEC-2021-605","PYSEC-2021-803"],"url":"https://o3.security/vulnerability/CVE-2021-37692","summary":"Segfault on strings tensors with mistmatched dimensions, due to Go code","details":"### Impact\nUnder certain conditions, Go code can trigger a segfault in string deallocation.\n\n\nFor string tensors, `C.TF_TString_Dealloc` is called during garbage collection within a finalizer function.  However, tensor structure isn't checked until encoding to avoid a performance penalty.  The current method for dealloc assumes that encoding succeeded, but segfaults when a string tensor is garbage collected whose encoding failed (e.g., due to mismatched dimensions).\n\nTo fix this, the call to set the finalizer function is deferred until `NewTensor` returns and, if encoding failed for a string tensor, deallocs are determined based on bytes written.\n\n### Patches\nWe have patched the issue in GitHub commit [8721ba96e5760c229217b594f6d2ba332beedf22](https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22) (merging [#50508](https://github.com/tensorflow/tensorflow/pull/50508)).\n\nThe fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, which is the other affected version.                                                                                                                                               \n\n### For more information\nPlease consult [our security guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for more information regarding the security model and how to contact us with issues and questions.\n\n### Attribution\nThis vulnerability has been reported externally via a [fixing PR](https://github.com/tensorflow/tensorflow/pull/50508).","published":"2021-08-12T23:15:08.967Z","modified":"2026-08-07T19:46:47.095979Z","cvss":{"score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"tensorflow","fixedVersion":"2.5.1"},{"ecosystem":"PyPI","name":"tensorflow-cpu","fixedVersion":"2.5.1"},{"ecosystem":"PyPI","name":"tensorflow-gpu","fixedVersion":"2.5.1"}],"fix":{"url":"https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22","label":"tensorflow/tensorflow@8721ba9"},"references":[{"type":"ADVISORY","url":"https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cmgw-8vpc-rc59"},{"type":"FIX","url":"https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22"},{"type":"FIX","url":"https://github.com/tensorflow/tensorflow/pull/50508"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37692"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-605.yaml"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-803.yaml"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-314.yaml"},{"type":"PACKAGE","url":"https://github.com/tensorflow/tensorflow"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T19:46:47.095979Z"}}