Medium severity · published Aug 17, 2026
CVE-2026-68762
In JetBrains Ktor before 3.4.1 potential DoS attack via WebSocket decompression was possible
5.9
CVSS
0.4%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KT
Ktor · JetBrains
before 3.4.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-68762
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-68762
www.jetbrains.com
https://www.jetbrains.com/privacy-security/issues-fixed/
More from Ktor
9.8
CVE-2023-45612
In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE
9.8
CVE-2019-12736
JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the user for the LDAP protocol, leading to command injection
9.1
CVE-2023-45613
In JetBrains Ktor before 2.3.5 server certificates were not verified
8.1
CVE-2019-10102
JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0 were resolving artifacts using an http connection during the build process, potentially…
7.5
CVE-2022-48476
In JetBrains Ktor before 2.3.0 path traversal in the `resolveResource` method was possible