CVE-2022-1941High· 7.5▾ Twilightprotobuf-cpp and protobuf-python have potential Denial of Service issue
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.3 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
1.2%
1.2% → 1.5%
A message parsing and memory management vulnerability in ProtocolBuffer’s C++ and Python implementations can trigger an out of memory (OOM) failure when processing a specially crafted message, which could lead to a denial of service (DoS) on services using the libraries.
Reporter: ClusterFuzz
Affected versions: All versions of C++ Protobufs (including Python) prior to the versions listed below.
As scored by google
Medium 5.7 - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Asscored byt NIST
High 7.5 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
A small (~500 KB) malicious payload can be constructed which causes the running service to allocate more than 3GB of RAM.
For reproduction details, please refer to the unit test that identifies the specific inputs that exercise this parsing weakness.
Please update to the latest available versions of the following packages:
protobuf < 3.18.3protobuf >= 3.19.0, < 3.19.5protobuf >= 3.20.0, < 3.20.2protobuf >= 4.0.0, < 4.21.6Upgrade to a patched release:
protobuf 3.18.3protobuf 3.19.5protobuf 3.20.2protobuf 4.21.6Connected by shared product, vendor, weakness, or advisory.
CVE-2025-4565Highprotobuf-python has a potential Denial of Service issue
CVE-2026-0994High· 7.5A 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 ac…
CVE-2026-54451High· 8.2Elixir protobuf is a pure Elixir implementation of Google Protobuf