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CVE-2025-4565 — Unbounded recursion in Python Protobuf

Affected: protocolbuffers 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

USN-7629-1 — protobuf vulnerabilities

Affected: Ubuntu:22.04:LTS: protobuf, Ubuntu:24.04:LTS: protobuf

It was discovered that Protocol Buffers incorrectly handled memory when receiving malicious input using the Python bindings. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-4565)

It was discovered that Protocol Buffers incorrectly handled memory when receiving malicious input using the Java bindings. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.04. (CVE-2024-7254)