GHSA-cmgw-8vpc-rc59 Segfault on strings tensors with mistmatched dimensions, due to Go code

• PyPI tensorflow: >= 2.5.0rc0, < 2.5.1 → fixed in 2.5.1 • PyPI tensorflow-cpu: >= 2.5.0rc0, < 2.5.1 → fixed in 2.5.1 • PyPI tensorflow-gpu: >= 2.5.0rc0, < 2.5.1 → fixed in 2.5.1

Impact 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. Patches We have patched the issue in GitHub commit 8721ba96e5760c229217b594f6d2ba332beedf22 (merging #50508). The 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. For more information Please consult our security guide for more information regarding the security model and how to contact us with issues and questions. Attribution This vulnerability has been reported externally via a fixing PR.