In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Jetbrains
  • Ktor

No data.

No data.

References
Link Providers
https://www.jetbrains.com/privacy-security/issues-fixed/ cve-icon cve-icon
History

Fri, 06 Nov 2026 12:30:00 +0000

Type Values Removed Values Added
First Time appeared Jetbrains
Jetbrains ktor
Vendors & Products Jetbrains
Jetbrains ktor

Fri, 06 Nov 2026 12:00:00 +0000

Type Values Removed Values Added
Title Ktor CIO Engine HTTP Request Smuggling Vulnerability

Fri, 06 Nov 2026 10:30:00 +0000

Type Values Removed Values Added
Description In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: JetBrains

Published: 2026-11-06T10:28:04.880Z

Updated: 2026-11-06T10:28:04.880Z

Reserved: 2026-11-05T18:38:26.699Z

Link: CVE-2026-123318

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-06T11:17:11.317

Modified: 2026-11-06T11:17:11.317

Link: CVE-2026-123318

cve-icon Redhat

No data.