{"cve":"CVE-2026-53522","nvd":{"published":"2026-06-12T22:16:52.377","modified":"2026-10-25T23:10:00.167","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-770"],"references":["https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq","https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-53522","score":0.0029,"percentile":0.21317,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-jg62-j5h6-8mpq","url":"https://osv.dev/vulnerability/GHSA-jg62-j5h6-8mpq","summary":"Nezha Monitoring: Unbounded WebSocket Streams — Resource Exhaustion DoS","modified":"2026-07-07T16:11:11.689384026Z","packages":[{"ecosystem":"Go","name":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","ranges":[">=1.0.0 <2.2.0"],"fixed":["2.2.0"]}]},{"id":"GO-2026-5831","url":"https://osv.dev/vulnerability/GO-2026-5831","summary":"Nezha Monitoring: Unbounded WebSocket Streams — Resource Exhaustion DoS in github.com/nezhahq/nezha","modified":"2026-07-07T16:01:34.737964741Z","packages":[{"ecosystem":"Go","name":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","ranges":[">=1.0.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}