7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2022-31019

GHSA ID

GHSA-qvxg-wjxc-r4gg

EPSS Score

0.57117%

CWE

CWE-120

Published

6/7/2023

Updated

6/30/2023

KEV Status

Technology

Swift

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2022-31019

CVE-2022-31019: Vapor vulnerable to denial of service in URLEncodedFormDecoder

Vapor is an HTTP web framework for Swift. Vapor versions earlier than 4.61.1 are vulnerable to a denial of service in the URLEncodedFormDecoder.

Impact

When using automatic content decoding, e.g.

app.post("foo") { request -> String in
  let foo = try request.content.decode(Foo.self)
  return "\(foo)"
}

An attacker can craft a request body that can make the server crash with the following request:

curl -d "array[_0][0][array][_0][0][array]$(for f in $(seq 1100); do echo -n '[_0][0][array]'; done)[string][_0]=hello%20world" http://localhost:8080/foo

The issue is unbounded, attacker controlled stack growth which will at some point lead to a stack overflow.

Patches

Fixed in 4.61.1

Workarounds

If you don't need to decode Form URL Encoded data, you can disable the ContentConfiguration so it won't be used. E.g. in configure.swift

var contentConfig = ContentConfiguration()
contentConfig.use(encoder: JSONEncoder.custom(dates: .iso8601), for: .json)
contentConfig.use(decoder: JSONDecoder.custom(dates: .iso8601), for: .json)
contentConfig.use(encoder: JSONEncoder.custom(dates: .iso8601), for: .jsonAPI)
contentConfig.use(decoder: JSONDecoder.custom(dates: .iso8601), for: .jsonAPI)
ContentConfiguration.global = contentConfig

For more information

If you have any questions or comments about this advisory:

Open an issue in the Vapor repo
Ask in Vapor Discord

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2022-31019

CVE-2022-31019:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2022-31019

GHSA ID

GHSA-qvxg-wjxc-r4gg

EPSS Score

0.57117%

CWE

CWE-120

Published

6/7/2023

Updated

6/30/2023

KEV Status

Technology

Swift

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/vapor/vapor	swift	< 4.61.1	4.61.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from the recursive set() function handling nested form data. The pre-patch implementation lacked recursion depth checks, allowing attackers to create arbitrarily deep nesting (via array index patterns like array[_0][0][array]...). The commit adds a maxRecursionDepthcheck and throws an error when exceeded, confirming this was the vulnerable entry point. The CWE-674 (Uncontrolled Recursion) classification and crash reproduction using deeply nested arrays furthervalidate` this analysis.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

7.5

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2022-31019: Vapor vulnerable to denial of service in URLEncodedFormDecoder

Impact

Patches

Workarounds

For more information

CVE-2022-31019:

7.5

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Technical Details

CVE-2022-31019: Vapor vulnerable to denial of service in URLEncodedFormDecoder

Impact

Patches

Workarounds

For more information

7.5

7.5

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI