Summary
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') in Armeria
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.
Root Cause
The root cause is due to the usage of Netty without the HTTP header validation.
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
Impact
- Cross-User Defacement
- Cache Poisoning
- Cross-Site Scripting (XSS)
- Page Hijacking
GHSA-35FR-H7JR-HH86 has a CVSS score of 6.5 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.97.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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This vulnerability has been patched in 0.97.0.
Frequently Asked Questions
- What is GHSA-35FR-H7JR-HH86? GHSA-35FR-H7JR-HH86 is a medium-severity security vulnerability in com.linecorp.armeria:armeria (maven), affecting versions >= 0.85.0, < 0.97.0. It is fixed in 0.97.0.
- How severe is GHSA-35FR-H7JR-HH86? GHSA-35FR-H7JR-HH86 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of com.linecorp.armeria:armeria are affected by GHSA-35FR-H7JR-HH86? com.linecorp.armeria:armeria (maven) versions >= 0.85.0, < 0.97.0 is affected.
- Is there a fix for GHSA-35FR-H7JR-HH86? Yes. GHSA-35FR-H7JR-HH86 is fixed in 0.97.0. Upgrade to this version or later.
- Is GHSA-35FR-H7JR-HH86 exploitable, and should I be worried? Whether GHSA-35FR-H7JR-HH86 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-35FR-H7JR-HH86 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-35FR-H7JR-HH86? Upgrade
com.linecorp.armeria:armeriato 0.97.0 or later.