Security readout for executives and security teams
Plain-English summary
Ktor versions before 1.2.6 had an HTTP response splitting flaw. For affected web services, a crafted input could potentially influence HTTP headers or responses, which may enable downstream issues such as cache or response manipulation. The bundle does not provide a CVSS score, CWE, or evidence of active exploitation.
Executive priority
Handle as a dependency hygiene issue with moderate urgency. It is not listed as actively exploited in the bundle, but affected public web services should be upgraded because response splitting can undermine trust in HTTP responses.
Technical view
CVE-2019-19389 affects JetBrains Ktor framework before 1.2.6 and is described as HTTP Response Splitting. The source bundle does not include affected CPEs, CVSS details, or root-cause specifics. Treat exposure as dependency-based: Ktor applications running versions older than 1.2.6 need review and upgrade.
Likely exposure
Exposure is likely limited to applications built with JetBrains Ktor before 1.2.6, especially internet-facing services. The bundle does not identify specific distributions, CPEs, deployment patterns, or vulnerable endpoints.
Exploitation context
No source in the bundle reports active exploitation, and KEV is false. Exploitability depends on whether an affected Ktor application lets untrusted input influence response headers or similar response metadata.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, or detailed advisory is provided. The strongest source-grounded statement is that Ktor before 1.2.6 was vulnerable to HTTP Response Splitting, with a referenced Ktor pull request and researcher disclosure materials.
Mitigation direction
- Upgrade Ktor dependencies to version 1.2.6 or later.
- Prioritize internet-facing Ktor services and authentication-adjacent flows.
- Check JetBrains or Ktor project guidance for any additional remediation notes.
- Redeploy rebuilt services after dependency updates.
- Monitor logs for unusual response/header behavior where feasible.
Validation and detection
- Inventory applications using JetBrains Ktor.
- Confirm no deployed service uses Ktor before 1.2.6.
- Review dependency lockfiles and build outputs for Ktor versions.
- Verify upgraded services run the expected Ktor version.
- Document any legacy Ktor deployments that cannot be upgraded immediately.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-19389 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ktorio/ktor/pull/1408CVE reference · x_refsource_MISC
- https://gist.github.com/JLLeitschuh/6792947ed57d589b08c1cc8b666c7737CVE reference · x_refsource_MISC
- https://twitter.com/JLLeitschuh/status/1210256191110230017?s=20CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.