CVE-2026-123318

Ktor CIO Engine HTTP Request Smuggling Vulnerability

Published Nov 6, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Description
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Jetbrains
Jetbrains ktor
Vendors & Products Jetbrains
Jetbrains ktor
Type Values Removed Values Added
Title Ktor CIO Engine HTTP Request Smuggling Vulnerability
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
JetBrains
Published
Updated
Nov 10, 2026, 5:51 PM
Reserved
Nov 5, 2026, 6:38 PM
Status
Awaiting Analysis
Published
Nov 6, 2026, 11:17 AM
Modified
Nov 10, 2026, 6:17 PM