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MEDIUM severity

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in ArmeriaGHSA-35fr-h7jr-hh86

MEDIUM

GHSA-35fr-h7jr-hh86 is a medium-severity (CVSS 6.5) CWE-113 vulnerability in com.linecorp.armeria:armeria. A fix is available for com.linecorp.armeria:armeria — see the affected versions and patch details below.

Also known asCVE-2019-16771GHSA-24r8-fm9r-cpj2
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs62th percentile — riskier than 62% of all scored CVEsHighest risk
0.00%0.49%0.99%1.48%0.4%1.0%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕com.linecorp.armeria:armeria

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

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:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavencom.linecorp.armeria:armeria≥ 0.85.0&&< 0.97.00.97.0com.linecorp.armeria:armeria:0.97.0

Affected Products

1 product · 1 configurations
Application
armerialinecorp
≥ 0.85.0 && < 0.97.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.linecorp.armeria:armeria, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update com.linecorp.armeria:armeria to 0.97.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-35fr-h7jr-hh86 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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/DefaultHttpHead
O3 Security · Impact-Aware SCA

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Improper Neutralization of CRLF Sequences in HTTP…