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Low severityNVD Advisory· Published May 14, 2021· Updated Aug 3, 2024

Segfault in `CTCBeamSearchDecoder`

CVE-2021-29581

Description

TensorFlow is an end-to-end open source platform for machine learning. Due to lack of validation in tf.raw_ops.CTCBeamSearchDecoder, an attacker can trigger denial of service via segmentation faults. The implementation(https://github.com/tensorflow/tensorflow/blob/a74768f8e4efbda4def9f16ee7e13cf3922ac5f7/tensorflow/core/kernels/ctc_decoder_ops.cc#L68-L79) fails to detect cases when the input tensor is empty and proceeds to read data from a null buffer. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
tensorflowPyPI
< 2.1.42.1.4
tensorflowPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflowPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflowPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-cpuPyPI
< 2.1.42.1.4
tensorflow-cpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-cpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-cpuPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-gpuPyPI
< 2.1.42.1.4
tensorflow-gpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-gpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-gpuPyPI
>= 2.4.0, < 2.4.22.4.2

Affected products

1

Patches

1
b1b323042264

Fix SEGV in CTC ops

https://github.com/tensorflow/tensorflowMihai MaruseacMay 6, 2021via ghsa
commit
1 file changed · +3 −0
  • tensorflow/core/kernels/ctc_decoder_ops.cc+3 −0 modified
    @@ -70,6 +70,9 @@ class CTCDecodeHelper {
     if (inputs_shape.dims() != 3) {
       return errors::InvalidArgument("inputs is not a 3-Tensor");
     }
+    if (inputs_shape.num_elements() == 0) {
+      return errors::InvalidArgument("inputs must not be empty");
+    }
 
     const int64 max_time = inputs_shape.dim_size(0);
     const int64 batch_size = inputs_shape.dim_size(1);

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

7

News mentions

0

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