HTTP Request Smuggling Vulnerability in JetBrains Ktor
CVE-2026-123318

4.8MEDIUM

Key Information:

Vendor

Jetbrains
Status
Ktor
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123318?

An HTTP request smuggling vulnerability exists in JetBrains Ktor prior to version 3.6.1, allowing attackers to exploit the CIO engine. This vulnerability can enable malicious actors to manipulate the order of requests sent to a server, potentially leading to unauthorized access or denial of service. It is vital for users and developers to update to the latest version to safeguard their applications from these types of attacks. For more detailed information, please refer to JetBrains' security updates.

Affected Version(s)

Ktor 0 < 3.6.1

References

https://www.jetbrains.com/privacy-security/issues-fixed/

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.