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Description

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.

PUBLISHED Reserved 2026-01-15 | Published 2026-01-23 | Updated 2026-01-30 | Assigner Google




HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Problem types

CWE-674: Uncontrolled Recursion

Product status

Default status
unaffected

<=v33.4 (custom)
affected

References

github.com/protocolbuffers/protobuf/pull/25239

cve.org (CVE-2026-0994)

nvd.nist.gov (CVE-2026-0994)

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