7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-3064

CVE-2022-3064: yaml package for Go can consume excessive amounts of CPU or memory

Parsing malicious or large YAML documents can consume excessive amounts of CPU or memory

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2022-3064

CVE-2022-3064:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
gopkg.in/yaml.v2	go	< 2.2.4	2.2.4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from two main issues: 1) Uncontrolled alias expansion in decoding logic, and 2) Lack of depth limits in parser state management. The commit adds three key protections: alias ratio scaling in decode.go's unmarshal, flow level limits in yaml_parser_increase_flow_level, and indentation depth checks in yaml_parser_roll_indent. These functions directly correspond to the CWE-400 resource consumption vectors described - alias abuse (memory) and deep nesting (CPU). The pre-patch versions of these functions lacked the constraints shown in the diff (max_flow_level, max_indents, and dynamic alias ratio calculation), making them the vulnerable entry points.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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