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protobuf vulnerabilities

Vulnerabilities published for protobuf in the last 30 days: 0. Listed in the KEV catalogue: 0.

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Vulnerabilities: 5

  1. CVE-2026-0994

    High · CVSS 8.2EPSS 0.71%Fix available

    Denial of Service in Python Protobuf

    A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages. Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.

    protobuf protobuf protobufPython
    • Update to 5.29.6
    • Update to 6.33.5
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  2. CVE-2025-4565

    High · CVSS 8.2EPSS 0.26%Fix available

    Unbounded recursion in Python Protobuf

    Any project that uses Protobuf Pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of SGROUP tags can be corrupted by exceeding the Python recursion limit. This can result in a Denial of service by crashing the application with a RecursionError. We recommend upgrading to version =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901

    protobuf protobuf protobuf protobufPython
    • Update to 4.25.8
    • Update to 5.29.5
    • Update to 6.31.1
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗

  3. CVE-2022-1941

    High · CVSS 7.5EPSS 1.51%Fix available

    Out of Memory issue in ProtocolBuffers for cpp and python

    A parsing vulnerability for the MessageSet type in the ProtocolBuffers versions prior to and including 3.16.1, 3.17.3, 3.18.2, 3.19.4, 3.20.1 and 3.21.5 for protobuf-cpp, and versions prior to and including 3.16.1, 3.17.3, 3.18.2, 3.19.4, 3.20.1 and 4.21.5 for protobuf-python can lead to out of memory failures. A specially crafted message with multiple key-value per elements creates parsing issues, and can lead to a Denial of Service against services receiving unsanitized input. We recommend upgrading to versions 3.18.3, 3.19.5, 3.20.2, 3.21.6 for protobuf-cpp and 3.18.3, 3.19.5, 3.20.2, 4.21.6 for protobuf-python. Versions for 3.16 and 3.17

    protobuf protobuf protobuf protobuf protobufPython
    • Update to 3.18.3
    • Update to 3.19.5
    • Update to 3.20.2
    • Update to 4.21.6
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  4. CVE-2021-22570

    Medium · CVSS 6.5EPSS 2.66%Fix available

    Nullptr Dereference in Protobuf

    Nullptr dereference when a null char is present in a proto symbol. The symbol is parsed incorrectly, leading to an unchecked call into the proto file's name during generation of the resulting error message. Since the symbol is incorrectly parsed, the file is nullptr. We recommend upgrading to version 3.15.0 or greater.

    protobufPython
    • Update to 3.15.0
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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