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CVE-2026-54451 is a denial-of-service vulnerability in the Hex package protobuf affecting Protobuf.Decoder during decoding of embedded messages. The flaw stems from unbounded recursion depth when processing deeply nested self-referential or cyclic protobuf message structures. A crafted protobuf payload can drive the decoder into extremely deep recursive descent without an effective depth limit, resulting in excessive resource consumption. Fixed versions introduce recursion-depth limiting during embedded-message decoding and raise Protobuf.DecodeError when the configured limit is exceeded.
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No public exploit code observed for this vulnerability.
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No public activity observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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