EUVD-2026-60242
GHSA-cw22-f535-mjjw
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable WebSocket endpoint (AV:N), but crafting the malformed compressed payload requires attack sophistication (AC:H); no auth or interaction needed; impact is availability-only.
Primary rating from Vendor (jetbrains).
CVSS VectorVendor: jetbrains
Lifecycle Timeline
2DescriptionCVE.org
In JetBrains Ktor before 3.4.1 potential DoS attack via WebSocket decompression was possible
AnalysisAI
Denial of service via WebSocket decompression in JetBrains Ktor before 3.4.1 allows unauthenticated remote attackers to exhaust server resources or trigger an infinite loop by sending crafted compressed WebSocket messages. The root cause is CWE-835 (Loop with Unreachable Exit Condition), meaning the decompression routine can enter a state from which it cannot exit, stalling the affected connection handler or the broader server process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Ktor application has WebSocket support enabled and that the permessage-deflate (WebSocket compression) extension is active - this is a non-default configuration that must be explicitly enabled in Ktor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.9 (Medium) reflects the tension between the high availability impact (A:H) and the high attack complexity (AC:H), which tempers the practical exploitability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade JetBrains Ktor to version 3.4.1 or later, which resolves the WebSocket decompression loop condition. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Denial Of Service
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External POC / Exploit Code
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