CVE-2026-68762Network attack vector

Service interrupt via WebSocket decompression

Published Aug 17, 2026 · Updated Aug 17, 2026

Denial of service in JetBrains Ktor before 3.4.1 allows remote attackers to interrupt service via crafted compressed WebSocket messages. JetBrains has not published which WebSocket decompression routine fails; the public record discloses only that compressed-frame handling reaches a denial-of-service condition during decompression. Exposure requires an application that accepts attacker-controlled compressed WebSocket traffic, and published scoring bounds the consequence to availability loss rather than data disclosure or modification.

CVSS severity5.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in JetBrains Ktor before 3.4.1 allows remote attackers to interrupt service via crafted compressed WebSocket messages. JetBrains has not published which WebSocket decompression routine fails; the public record discloses only that compressed-frame handling reaches a denial-of-service condition during decompression. Exposure requires an application that accepts attacker-controlled compressed WebSocket traffic, and published scoring bounds the consequence to availability loss rather than data disclosure or modification.

The record

CVE
CVE-2026-68762
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
JetBrains
Product
Ktor
Classifications
CWE-835, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · Ktorversion=0 <3.4.1

Published CVSS scores

5.9JetBrains CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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