CVE-2026-0994

Summary

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.

Affected Software

VendorProductVersion RangeStatus
PythonProtobuf<=v33.4affected

Weaknesses

  • CWE-674: CWE-674: Uncontrolled Recursion

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

python: protobuf: Protobuf: Denial of Service due to recursion depth bypass

Additional References

References