CVE-2026-53522

The record

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the Nezha dashboard exposes two endpoints that create long-lived WebSocket streams to monitored agents: POST /api/v1/terminal → createTerminal() (terminal.go:27-67) and POST /api/v1/file → createFM() (fm.go:28-67). Both call rpc.NezhaHandlerSingleton.CreateStream(streamId, ...) which inserts a new ioStreamContext into an unbounded map[string]*ioStreamContext (s.ioStreams in io_stream.go:59-67). There is no per-user rate limit, no global semaphore, and no per-server connection cap. This issue has been patched in version 2.2.0.

Affected packages

Related vulnerabilities

• CVE-2026-114731 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an uncontrolled… CWE-770
• CVE-2026-96377 Allocation of Resources Without Limits or Throttling vulnerability in Drupal Combined… CWE-770
• CVE-2026-96365 Allocation of Resources Without Limits or Throttling vulnerability in Drupal Webform… CWE-770
• CVE-2026-114723 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 allows the ImageMagick resource… CWE-770
• CVE-2026-113811 Algorithm::UrataniTakeda versions from 0.1.5 before 0.1.7 for Perl allow memory… CWE-770
• CVE-2026-113795 pypdf is a free and open-source pure-python PDF library. CWE-770
• CVE-2026-112400 Pillow is a Python imaging library. CWE-770
• CVE-2026-111064 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. CWE-770