Read the docs
TI-2026-75130 Aliases CVE-2026-111383

Nezha WebSocket transfer endpoint flaw enables denial of service

Priority MEDIUM 64CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

Nezha from 2.0.13 before 2.3.15 contains a resource exhaustion flaw that lets authenticated users open an unlimited number of concurrent connections to the /api/v1/ws/transfer WebSocket endpoint. Because the subscriptions are not limited (CWE-770), an attacker can hold thousands of them and exhaust file descriptors, memory and goroutines. This blocks agent gRPC reconnections, and an attacker needs only low-privileged authenticated access over the network.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00358 29th percentileScored 2026-11-07
Fix Fixed nezha (nezhahq): 2.3.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nezhahqnezha2.0.13 to before 2.3.152.3.15Patch availableCNA
  • nezha Vendornezhahq Affected 2.0.13 to before 2.3.15 Fixed in 2.3.15 Patch available CNA

Remediation

Update Nezha to version 2.3.15, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA nezha (nezhahq) Fixed in 2.3.15

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    nezhahq nezha 2.3.15

    5 records Highest priority Priority MEDIUM 4 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-75131 Memory exhaustion in Nezha file manager WebSocket endpointPriority MEDIUM 64
    • TI-2026-75132 Host header injection in Nezha MCP transfer toolsPriority MEDIUM 61
    • TI-2026-75133 Cross-tenant server ID enumeration in Nezha via getServerConfigPriority MEDIUM 57
    Show all 5 records →

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111383
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-16 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 1

  • TI-2026-65123 Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri CVSS 4.0CRITICAL 9.3
  • TI-2026-34341 Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron CVSS 3.1CRITICAL 9.9
  • TI-2026-34342 Nezha Monitoring: RoleMember-reachable SSRF with full response-body reflection via POST /api/v1/notification CVSS 3.1HIGH 7.7
  • TI-2026-38597 Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection CVSS 3.1MEDIUM 6.8
  • TI-2026-75131 Memory exhaustion in Nezha file manager WebSocket endpoint CVSS 4.0HIGH 7.1
  • TI-2026-67488 Nezha 1.8.0 before 2.3.13 Denial of Service via Notification Mutex Deadlock CVSS 4.0HIGH 7.1
See all 29 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences