How severe is CVE-2019-19389?

CVE-2019-19389 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-19389 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19389?

CVE-2019-19389 affects Jetbrains Ktor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-19389?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-19389 published?

CVE-2019-19389 was published on 2019-12-26 and last updated on 2026-06-17.

CVE-2019-19389

CVE-2019-19389 is a medium-severity vulnerability in Jetbrains Ktor with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Jetbrains Ktor
Published: 2019-12-26
Last modified: 2026-06-17

Description

JetBrains Ktor framework before version 1.2.6 was vulnerable to HTTP Response Splitting.

Frequently asked questions

What is CVE-2019-19389?: JetBrains Ktor framework before version 1.2.6 was vulnerable to HTTP Response Splitting.
How severe is CVE-2019-19389?: CVE-2019-19389 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-19389 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19389?: CVE-2019-19389 affects Jetbrains Ktor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-19389?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-19389 published?: CVE-2019-19389 was published on 2019-12-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Ktor

CVE-2019-12736 — Critical (CVSS 9.8): JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the user for the LDAP protocol,…
CVE-2022-29930 — High (CVSS 8.7): SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. The issue was fixed in Ktor version…
CVE-2023-45612 — High (CVSS 8.6): In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE
CVE-2019-10102 — High (CVSS 8.1): JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0 were resolving artifacts using…
CVE-2022-48476 — High (CVSS 7.5): In JetBrains Ktor before 2.3.0 path traversal in the `resolveResource` method was possible
CVE-2021-43203 — High (CVSS 7.5): In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.

All CVEs affecting Jetbrains Ktor →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-25586 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty…
CVE-2026-25520 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped.…
CVE-2025-20265 — Critical (CVSS 10.0): A vulnerability in the RADIUS subsystem implementation of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2025-20337 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-20281 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2024-42472 — Critical (CVSS 10.0): Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →