CVSS 3.1
4.8 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2026-123318
Medium (4.8) in jetbrains ktor. EPSS 0.1% estimated probability of exploitation activity in the next 30 days.
In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engine
Severity
- EPSS
- 0.1% estimated probability of exploitation activity in the next 30 days; 4th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-444 Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)
- OWASP Top 10
- A06:2025 Insecure Design
- Published
- Modified
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Explain CVE-2026-123318 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-123318?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-123318?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-123318 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| JetBrains Ktor | before 3.6.1 |
Attack patterns (CAPEC)
- CAPEC-33 HTTP Request Smuggling Likelihood: Medium · Severity: High
- CAPEC-273 HTTP Response Smuggling Likelihood: Medium · Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.