PyPI: tensorflow

CVE-2021-37692

Safety vulnerability ID: SFTY-20210812-59349

Safety legacy ID: pyup.io-41168

Tensorflow versions 2.5.1 and 2.6.0 include a fix for CVE-2021-37692: In affected versions under certain conditions, Go code can trigger a segfault in string deallocation. For 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). To 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. The Tensorflow team has patched the issue in GitHub commit: https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22 https://github.com/tensorflow/tensorflow/pull/50508 https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cmgw-8vpc-rc59

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Created at: Jul 5, 2026Updated at: Jul 5, 2026

Overview

Segfault on strings tensors with mistmatched dimensions, due to Go code

Advisory

Tensorflow versions 2.5.1 and 2.6.0 include a fix for CVE-2021-37692: In affected versions under certain conditions, Go code can trigger a segfault in string deallocation. For 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). To 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. The Tensorflow team has patched the issue in GitHub commit: https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22 https://github.com/tensorflow/tensorflow/pull/50508 https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cmgw-8vpc-rc59

Affected Package

Affecting tensorflow package, versions>=2.5.0rc0,<2.5.1>=2.6.0rc0,<2.6.0

Also affects

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How to Fix

Upgradetensorflowto2.5.12.6.0or higher.

Mitigation and Workarounds

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Vulnerable Functions

Functions linked to known vulnerabilities.

Vulnerable function data is available for Enterprise customers

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References

Safety

Verified by Safety

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