Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in Armeria

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

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. Impact 1. Cross-User Defacement 2. Cache Poisoning 3. Cross-Site Scripting (XSS) 4. Page Hijacking Root Cause The root cause is due to the usage of Netty without the HTTP header validation. https://github.com/line/armeria/blob/f0d870fde1088114070be31b67f7df0a21e835c6/core/src/main/java/com/linecorp/armeria/common/DefaultHttpHeaders.java#L23 Patches This vulnerability has been patched in 0.97.0. References CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') https://github.com/ratpack/ratpack/security/advisories/GHSA-mvqp-q37c-wf9j For more information If you have any questions or comments about this advisory: Open an issue in GitHub

Published by the source

6 Dec 2019, 18:55 UTC

Last modified by the source

9 Jan 2023, 05:04 UTC

Source last checked

26 Oct 2026, 15:53 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-35fr-h7jr-hh86

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# Patch Next advisory brief: GHSA-35fr-h7jr-hh86

Advisory: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in Armeria
IDs: GHSA-35fr-h7jr-hh86
Record: https://patchnext.com/advisories/ghsa-35fr-h7jr-hh86 (revision 1, source checked 26 Oct 2026, 15:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.linecorp.armeria:armeria 0.97.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.linecorp.armeria:armeria: affected >= 0.85.0, < 0.97.0; fixed in 0.97.0

## Suggested inspection (read-only)
- Maven com.linecorp.armeria:armeria: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.linecorp.armeria:armeria.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-35fr-h7jr-hh86 (GitHub-reviewed advisory GHSA-35fr-h7jr-hh86 lists affected ranges: Maven com.linecorp.armeria:armeria >=0.85.0 <0.97.0)

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