In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
Priority LOW 28CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-601.
Summary
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
Why it matters now
EPSS 0.00642 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed io.ktor:ktor-client-core (Maven): 1.3.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | io.ktor:ktor-client-core (Maven) | before 1.3.0 | 1.3.0 | Patch available | GHSA-xwgq-pcqx-hpmv |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- io.ktor:ktor-client-core (Maven) Vendor— Affected before 1.3.0 Fixed in 1.3.0 Patch available GHSA-xwgq-pcqx-hpmv
Remediation
- Fix · GHSA-xwgq-pcqx-hpmv io.ktor:ktor-client-core (Maven) Fixed in 1.3.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-19703
- 2026-10-03 Alias added: GHSA-xwgq-pcqx-hpmv
- 2026-10-21 EPSS moved to the 50th–90th percentile
References
More JetBrains Ktor vulnerabilities
- TI-2023-24413 In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE CVSS 3.1CRITICAL 9.8
- TI-2019-09527 JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the… CVSS 3.1CRITICAL 9.8
- TI-2023-24414 In JetBrains Ktor before 2.3.5 server certificates were not verified CVSS 3.1CRITICAL 9.1
- TI-2022-24056 In JetBrains Ktor before 2.3.0 path traversal in the `resolveResource` method was possible CVSS 3.1HIGH 7.5
- TI-2022-12277 SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. CVSS 3.1HIGH 8.7
- TI-2019-07426 JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0… CVSS 3.0HIGH 8.1
Sources
- CVE-2019-19703 · CVE Program
- CVE-2019-19703 · NVD
- FIRST EPSS
- GHSA-xwgq-pcqx-hpmv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences