CVE-2026-123318
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
- Record
CVE-2026-123318- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-444
- Updated
- 2026-11-06
EUVDEUVD-2026-118082
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
- Record
EUVD-2026-118082- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-6mmc-8ffm-69rw
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
- Record
GHSA-6mmc-8ffm-69rw- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-444
- Updated
- 2026-11-06
NVD
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
- Record
CVE-2026-123318- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-444
- Updated
- 2026-11-07
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| published | EUVD | |
| published | EUVD, NVD | |
| aliases, references, title | GitHub Advisories | |
| cwes, severity | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-123318 is a medium vulnerability (CVSS 4.8) in Jetbrains Ktor, published November 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 3rd percentile. No source names a fixed version.