CVE-2020-26129
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
- Record
CVE-2020-26129- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:P/A:N - Weakness
- CWE-444
- Updated
- 2026-11-02
CVE List No score
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
- Record
CVE-2020-26129- Updated
- 2026-11-02
EUVDEUVD-2020-18759 No score
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
- Record
EUVD-2020-18759- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4hv7-632m-j4jc No score
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
- Record
GHSA-4hv7-632m-j4jc- Weakness
- CWE-444
- Updated
- 2026-11-02
OSV
In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
- Record
CVE-2020-26129- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-26129 is a medium vulnerability (CVSS 6.5) in Jetbrains Ktor, published November 16, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.77%, the 55th percentile. No source names a fixed version.