Quick answers
- Is CVE-2026-68762 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-68762 being exploited in the wild.
- How severe is CVE-2026-68762?
- Medium severity, with a CVSS score of 5.9, published 17 August 2026.
- Which products and versions are affected?
- Jetbrains Ktor before 3.4.1.
- Is there a fix for CVE-2026-68762?
- A patch was published on 2026: Fixed in Ktor 3.4.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-68762 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-68762?
- Check whether you run Jetbrains Ktor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This vulnerability is a denial-of-service (DoS) flaw in Ktor's WebSocket decompression handling. The vulnerability exists in versions before 3.4.1 and can be exploited by sending specially crafted compressed WebSocket frames. An attacker with network access to a Ktor application using WebSocket functionality can trigger excessive resource consumption or application crashes. The attack requires no authentication or special preconditions beyond network reachability. The fix is available in Ktor 3.4.1 and later versions.
Affected products
- JetBrains Ktor before 3.4.1
Timeline
- 2026-08-17: disclosed
- 2026: patched: Fixed in Ktor 3.4.1