NezhaHQ Nezha up to 2.3.14 WebSocket Transfer /api/v1/ws/transfer ServerTransferClass.Subscribe resource consumption

Summaryinfo

A vulnerability has been found in NezhaHQ Nezha up to 2.3.14 and classified as problematic. Affected by this vulnerability is the function ServerTransferClass.Subscribe of the file /api/v1/ws/transfer of the component WebSocket Transfer. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-111383. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in NezhaHQ Nezha up to 2.3.14 and classified as problematic. This issue affects the function ServerTransferClass.Subscribe of the file /api/v1/ws/transfer of the component WebSocket Transfer. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. The summary by CVE is:

Nezha from 2.0.13 before 2.3.15 contains a resource exhaustion vulnerability that allows authenticated users to open unbounded concurrent connections to the /api/v1/ws/transfer WebSocket endpoint. Attackers can hold thousands of subscriptions created by ServerTransferClass.Subscribe without limits, exhausting file descriptors, memory, and goroutines and blocking agent gRPC reconnections.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-111383 since 10/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 2.3.15 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• NezhaHQ

Name

• Nezha

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8
• 2.3.9
• 2.3.10
• 2.3.11
• 2.3.12
• 2.3.13
• 2.3.14

Website

• Product: https://github.com/nezhahq/nezha/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion