Add OSS-Fuzz harness for JSON tensor REST API parser - #4143
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rishuranjanofficial wants to merge 1 commit into
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Add OSS-Fuzz harness for JSON tensor REST API parser#4143rishuranjanofficial wants to merge 1 commit into
rishuranjanofficial wants to merge 1 commit into
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Adds a libFuzzer harness covering the three HTTP REST API JSON parsing entry points in json_tensor.cc: - FillPredictRequestFromJson (/v1/models/*:predict) - FillClassificationRequestFromJson (/v1/models/*:classify) - FillRegressionRequestFromJson (/v1/models/*:regress) CVE-2025-0649 (uncontrolled recursion, stack overflow DoS) was found in this path. This harness enables continuous fuzzing via OSS-Fuzz to catch future regressions.
Author
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Happy to add a json_tensor_fuzzer_seed_corpus.zip with representative JSON payloads for each endpoint if that would help reviewers or the OSS-Fuzz integration. Let me know. |
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Aug 3, 2026
Adds continuous fuzzing for the TensorFlow Serving JSON tensor parser, which processes untrusted HTTP request bodies for the REST API (/v1/models/:predict, :classify, :regress). Fuzzer targets: - FillPredictRequestFromJson (DT_FLOAT, DT_STRING, DT_INT64 inputs) - FillClassificationRequestFromJson - FillRegressionRequestFromJson CVE-2025-0649 (uncontrolled recursion in GetDenseTensorShape / FillTensorProto) was found in this exact code path. This harness provides regression coverage and enables detection of future parser vulnerabilities. Companion fix PR: tensorflow/serving#4143
Author
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I've submitted this pull request and would appreciate a review when you have some bandwidth. Please let me know if any changes or additional context are needed. Thank you for your time and consideration. |
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Summary
This PR adds a libFuzzer fuzz harness targeting the JSON tensor parsing
layer in
tensorflow_serving/util/json_tensor.cc, which processesuntrusted HTTP request bodies for the TF Serving REST API.
What's fuzzed
POST /v1/models/*:predictFillPredictRequestFromJsonPOST /v1/models/*:classifyFillClassificationRequestFromJsonPOST /v1/models/*:regressFillRegressionRequestFromJsonThree tensor dtype variants are covered per endpoint (float, string/b64,
int64) to exercise different parsing branches including the base64 decode
path and the recursive shape inference path.
Security motivation
CVE-2025-0649 (uncontrolled recursion in
GetDenseTensorShapeandFillTensorProto, CVSS 7.5 HIGH) was found in this exact code path.The vulnerability allows an unauthenticated attacker to crash the
serving process with a single ~100 KB HTTP request.
Continuous fuzzing via OSS-Fuzz will:
caught before they reach users
Files changed
tensorflow_serving/util/json_tensor_fuzzer.cc— libFuzzer entry pointtensorflow_serving/util/BUILD— Bazel build target for the fuzzerRelated