JetBrains Ktor up to 3.4.0 WebSocket resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.5$0-$5k0.21+

Summaryinfo

A vulnerability described as problematic has been identified in JetBrains Ktor up to 3.4.0. Affected by this issue is some unknown functionality of the component WebSocket. The manipulation results in resource consumption. This vulnerability is identified as CVE-2026-68762. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in JetBrains Ktor up to 3.4.0. It has been classified as problematic. Affected is an unknown code block of the component WebSocket. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

In JetBrains Ktor before 3.4.1 potential DoS attack via WebSocket decompression was possible

The advisory is available at jetbrains.com. This vulnerability is traded as CVE-2026-68762 since 07/31/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 3.4.1 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA Vector (JetBrains): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Ktor 3.4.1

Timelineinfo

07/31/2026 CVE reserved
08/17/2026 +17 days Advisory disclosed
08/17/2026 +0 days VulDB entry created
08/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: jetbrains.com
Status: Confirmed

CVE: CVE-2026-68762 (🔒)
GCVE (CVE): GCVE-0-2026-68762
GCVE (VulDB): GCVE-100-391326

Entryinfo

Created: 08/17/2026 18:41
Changes: 08/17/2026 18:41 (63)
Complete: 🔍
Cache ID: 216::103

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