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TI-2026-75131 Aliases CVE-2026-111384

Memory exhaustion in Nezha file manager WebSocket endpoint

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 1.0.0 before 2.3.15 contains a memory exhaustion flaw in the dashboard file manager WebSocket endpoint, where the message size is never limited, which is CWE-770. An authenticated user with file manager permissions can send one oversized binary message to the file WebSocket endpoint, causing the process to run out of memory and get killed, which stops all agent monitoring. The CVSS 4.0 vector rates the attack as low complexity over the network with low privileges and no user interaction. Public proof-of-concept exploit code is reported, but the flaw is not listed in CISA KEV.

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

Description from the CNA

Nezha 1.0.0 before 2.3.15 contains a memory exhaustion vulnerability in the dashboard file manager WebSocket endpoint because fmStream never calls SetReadLimit, leaving message size unbounded. Authenticated users with file manager scopes can send one oversized binary message to /api/v1/ws/file/:id, triggering an OOM kill that drops all agent monitoring.

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
nezhahqnezha1.0.0 to before 2.3.152.3.15Patch availableCNA
  • nezha Vendornezhahq Affected 1.0.0 to before 2.3.15 Fixed in 2.3.15 Patch available CNA

Remediation

Upgrade nezhahq Nezha to version 2.3.15, which fixes the issue. The sources list no vendor advisory identifier for this fix.

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-2026-75130 Nezha WebSocket transfer endpoint flaw enables denial of servicePriority 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-2026-111384
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-23 CISA SSVC decision points changed
  4. 2026-10-23 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-2026-75130 Nezha WebSocket transfer endpoint flaw enables denial of service 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