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CVE-2026-0994— Denial of Service in Python Protobuf

Quick assessment

Affected
Python Protobuf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google protobuf是美国谷歌（Google）公司的一种数据交换格式。 Google protobuf存在安全漏洞，该漏洞源于google.protobuf.json_format.ParseDict函数在解析嵌套的google.protobuf.Any消息时可绕过max_recursion_depth限制，可能导致拒绝服务攻击。

CVSS 8.2 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Python Protobuf <=v33.4 affected
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I. Basic Information for CVE-2026-0994

Vulnerability Information
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Vulnerability Title
Denial of Service in Python Protobuf
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Google protobuf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google protobuf是美国谷歌（Google）公司的一种数据交换格式。 Google protobuf存在安全漏洞，该漏洞源于google.protobuf.json_format.ParseDict函数在解析嵌套的google.protobuf.Any消息时可绕过max_recursion_depth限制，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Protobuf <=v33.4 -

II. Public POCs for CVE-2026-0994

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III. Intelligence Information for CVE-2026-0994

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IV. Related Vulnerabilities

Same product: Protobuf
Same vendor: Python
Same weakness: CWE-674

V. Comments for CVE-2026-0994

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