What’s Vulnerable › Vulnerabilities

CVE-2019-19389

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-26 · updated 2026-06-17
• Weakness: CWE-74

Description

JetBrains Ktor framework before version 1.2.6 was vulnerable to HTTP Response Splitting.

Affected products

• JetBrains Ktor: before 1.2.6 — fixed in 1.2.6

How to fix

Upgrade to a fixed version: JetBrains Ktor 1.2.6. Check the vendor advisory for mitigations.

References

• https://gist.github.com/JLLeitschuh/6792947ed57d589b08c1cc8b666c7737
• https://github.com/ktorio/ktor/pull/1408
• https://twitter.com/JLLeitschuh/status/1210256191110230017?s=20
• https://gist.github.com/JLLeitschuh/6792947ed57d589b08c1cc8b666c7737
• https://github.com/ktorio/ktor/pull/1408
• https://twitter.com/JLLeitschuh/status/1210256191110230017?s=20

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