What’s Vulnerable › Vulnerabilities

CVE-2020-26129

• Severity: medium (CVSS 6.5 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: none known
• Published: 2020-11-16 · updated 2026-06-17
• Weakness: CWE-444

Description

In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.

Affected products

• JetBrains Ktor: before 1.4.1 — fixed in 1.4.1

How to fix

Upgrade to a fixed version: JetBrains Ktor 1.4.1. Check the vendor advisory for mitigations.

References

• https://blog.jetbrains.com
• https://blog.jetbrains.com/2020/11/16/jetbrains-security-bulletin-q3-2020/
• https://blog.jetbrains.com
• https://blog.jetbrains.com/2020/11/16/jetbrains-security-bulletin-q3-2020/

Get alerted when CVE-2020-26129 or the next vulnerability affects your stack