CVE-2020-26129

Name: CVE-2020-26129
Creator: NVD / NIST
Published: 2020-11-16T16:15:14.773+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.76%

Last modified Jun 17, 2026

CVE-2020-26129 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.. EPSS estimates a 0.76% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

0.76%

50.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Jetbrains	Ktor	< 1.4.1

References

https://blog.jetbrains.comVendor Advisory
https://blog.jetbrains.com/2020/11/16/jetbrains-security-bulletin-q3-2020/Vendor Advisory
https://blog.jetbrains.comVendor Advisory
https://blog.jetbrains.com/2020/11/16/jetbrains-security-bulletin-q3-2020/Vendor Advisory

Timeline

Published: Nov 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26129?

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

How severe is CVE-2020-26129?

CVE-2020-26129 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26129?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26129?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST