What’s Vulnerable › Vulnerabilities

CVE-2022-31019: DoS Vulnerability in URLEncodedFormDecoder in Vapor

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-09 · updated 2026-06-17
• Weakness: CWE-120

Description

Vapor is a server-side Swift HTTP web framework. When using automatic content decoding 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 and a process crash. This issue has been fixed in version 4.61.1.

Affected products

• vapor: before 4.61.1 — fixed in 4.61.1

How to fix

Upgrade to a fixed version: vapor 4.61.1. Check the vendor advisory for mitigations.

References

• https://github.com/vapor/vapor/commit/6c63226a4ab82ce53730eb1afb9ca63866fcf033
• https://github.com/vapor/vapor/security/advisories/GHSA-qvxg-wjxc-r4gg
• https://github.com/vapor/vapor/commit/6c63226a4ab82ce53730eb1afb9ca63866fcf033
• https://github.com/vapor/vapor/security/advisories/GHSA-qvxg-wjxc-r4gg

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