CVE-2023-45612: JetBrains Ktor

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE

Affected products

• JetBrains Ktor: before 2.3.5 (fixed in 2.3.5)

Published 2023-10-09. Last modified 2026-06-17.