What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-06 · updated 2026-06-17
• Weakness: CWE-113

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.

Affected products

• line armeria: from 0.85.0 before 0.97.0 — fixed in 0.97.0

How to fix

Upgrade to a fixed version: line armeria 0.97.0. Check the vendor advisory for mitigations.

References

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

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