CVE-2022-31019Public exploitNetwork attack vector

Server crash via unbounded form-data recursion

Published Jun 6, 2022 · Updated Apr 22, 2025

Uncontrolled recursion in Vapor before 4.61.1 allows remote attackers to crash servers through deeply nested URL-encoded form data. The URLEncodedFormData.set(value:forPath:) method recursively consumes attacker-controlled key-path segments without a depth bound. Automatic URL-encoded content decoding must process the crafted body, exhausting the process stack and interrupting the hosted service.

CVSS severity7.5
High
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Uncontrolled recursion in Vapor before 4.61.1 allows remote attackers to crash servers through deeply nested URL-encoded form data. The URLEncodedFormData.set(value:forPath:) method recursively consumes attacker-controlled key-path segments without a depth bound. Automatic URL-encoded content decoding must process the crafted body, exhausting the process stack and interrupting the hosted service.

The record

CVE
CVE-2022-31019
Published
Jun 6, 2022
Updated
Apr 22, 2025
Vendor
Vapor
Product
Vapor
Classifications
CWE-674, CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.61.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vapor · Vaporversion=< 4.61.1

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NISTAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo