CVE-2026-0994
Denial of Service in Python Protobuf
8.6CVSSHIGH
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.
CVSS Vector Breakdown
Exploitability
AV:NAccess VectorNetwork
AC:LAccess ComplexityLow
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityH
Weaknesses
Affected Products
and 5 more affected products View all →
Attack Graph
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Exploitability
Official Patch Available
MITRE ATT&CK
1 technique Impact
References
https://github.com/protocolbuffers/protobuf/pull/25239
github.com
https://access.redhat.com/security/cve/cve-2026-0994
access.redhat.com
http://repo.red-soft.ru/redos/8.0/x86_64/updates/
repo.red-soft.ru
and 6 more references View all →
Timeline
Published
Jan 23, 2026
Last Updated
Jan 26, 2026
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