TI-2026-38596 Aliases CVE-2026-53522 GHSA-jg62-j5h6-8mpq

Nezha Monitoring: Unbounded WebSocket Streams — Resource Exhaustion DoS

MEDIUM 62CWE-770Published 2026-06-12 · Updated 2026-06-15

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00348 28th percentileScored 2026-11-07

Fix Fixed nezha (nezhahq): 2.2.0github.com/nezhahq/nezha (Go): 2.2.0

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

Vendor	Product	Affected versions	Fixed in	Status	Source
nezhahq	nezha	1.0.0 to before 2.2.0	2.2.0	Patch available	CNA
—	github.com/nezhahq/nezha (Go)	1.0.0 to before 2.2.0	2.2.0	Patch available	GHSA-jg62-j5h6-8mpq

nezha Vendornezhahq Affected 1.0.0 to before 2.2.0 Fixed in 2.2.0 Patch available CNA
github.com/nezhahq/nezha (Go) Vendor— Affected 1.0.0 to before 2.2.0 Fixed in 2.2.0 Patch available GHSA-jg62-j5h6-8mpq

Remediation

Fix · CNA nezha (nezhahq) Fixed in 2.2.0
Fix · GHSA-jg62-j5h6-8mpq github.com/nezhahq/nezha (Go) Fixed in 2.2.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-53522
2026-10-03 Alias added: GHSA-jg62-j5h6-8mpq

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-53522

Other 2

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-2026-75130 Nezha WebSocket transfer endpoint flaw enables denial of service 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