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CVE-2026-0994

High

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.

SeverityHigh
CVSS7.5
Exploit probability—
ProductGoogle Protobuf
PublishedJan 23, 2026
First seenJan 23, 2026
Weakness typeCWE-674CWE-674

How to fix

Update
  • protobuf6.33.5, 5.29.6 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
google protobufv ≤ 33.4—
protobufPyPI6.30.0rc1 ≤ v < 6.33.5, v < 5.29.66.33.5, 5.29.6

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