Jetbrains Ktor — known CVE vulnerabilities

Every CVE whose affected-product data names Jetbrains Ktor, ordered by CVSS severity, with EPSS exploit prediction and CISA KEV status.

CVEs (21)

• CVE-2019-12736 — CVSS 9.8 (critical): JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the user for the LDAP protocol, leading to command…
• CVE-2022-29930 — CVSS 8.7 (high): SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value. The issue was fixed in Ktor version 2.0.1.
• CVE-2023-45612 — CVSS 8.6 (high): In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE
• CVE-2019-10102 — CVSS 8.1 (high): JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0 were resolving artifacts using an http connection…
• CVE-2021-43203 — CVSS 7.5 (high): In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.
• CVE-2022-48476 — CVSS 7.5 (high): In JetBrains Ktor before 2.3.0 path traversal in the `resolveResource` method was possible
• CVE-2023-45613 — CVSS 6.8 (medium): In JetBrains Ktor before 2.3.5 server certificates were not verified
• CVE-2020-26129 — CVSS 6.5 (medium): In JetBrains Ktor before 1.4.1, HTTP request smuggling was possible.
• CVE-2019-19703 — CVSS 6.1 (medium): In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
• CVE-2020-5207 — CVSS 5.4 (medium): In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn't handle Content-Length and Transfer-Encoding…
• CVE-2019-19389 — CVSS 5.4 (medium): JetBrains Ktor framework before version 1.2.6 was vulnerable to HTTP Response Splitting.
• CVE-2021-25762 — CVSS 5.3 (medium): In JetBrains Ktor before 1.4.3, HTTP Request Smuggling was possible.
• CVE-2021-25763 — CVSS 5.3 (medium): In JetBrains Ktor before 1.4.2, weak cipher suites were enabled by default.
• CVE-2024-49580 — CVSS 5.3 (medium): In JetBrains Ktor before 2.3.13 improper caching in HttpCache Plugin could lead to response information disclosure
• CVE-2022-38180 — CVSS 5.3 (medium): In JetBrains Ktor before 2.1.0 the wrong authentication provider could be selected in some cases
• CVE-2025-29904 — CVSS 5.3 (medium): In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible
• CVE-2021-25761 — CVSS 5.3 (medium): In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.
• CVE-2019-12737 — CVSS 5.3 (medium): UserHashedTableAuth in JetBrains Ktor framework before 1.2.0-rc uses a One-Way Hash with a Predictable Salt for storing user credentials.
• CVE-2022-38179 — CVSS 4.7 (medium): JetBrains Ktor before 2.1.0 was vulnerable to the Reflect File Download attack
• CVE-2023-34339 — CVSS 3.3 (low): In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message
• CVE-2022-29035 — CVSS 3.3 (low): In JetBrains Ktor Native before version 2.0.0 random values used for nonce generation weren't using SecureRandom implementations