{"id":"CVE-2026-49252","aliases":["EUVD-2026-37943","GHSA-9v98-6g37-x9g6"],"status":"published","title":"deepstream is vulnerable to prototype pollution","description":"deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5  are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.","severity":{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0047,"percentile":0.40972,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321"],"published":"2026-06-18T20:01:31Z","modified":"2026-10-28T02:31:03Z","fixes":[{"ecosystem":"npm","package":"@deepstream/server","fixed_in":["10.0.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@deepstream/server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.5"}]}]},{"source":"osv","ecosystem":"npm","package":"@deepstream/server","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"10.0.5"}]}]}],"products":[{"vendor":"deepstreamio","product":"deepstream.io"}],"references":[{"url":"https://github.com/deepstreamIO/deepstream.io/security/advisories/GHSA-9v98-6g37-x9g6","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/deepstreamIO/deepstream.io/commit/54b8e2958a98df444b5b5d9a66e22872afd84e44","tags":["x_refsource_MISC","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49252","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9v98-6g37-x9g6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49252.json","tags":["advisory"]},{"url":"https://github.com/deepstreamIO/deepstream.io","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-49252","title":"deepstream is vulnerable to prototype pollution","description":"deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5  are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.","status":"published","published":"2026-06-18T20:01:31.307Z","modified":"2026-06-22T15:11:26.795Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical","assessor":"cna"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T13:35:10.963527Z"}],"euvd":[{"id":"EUVD-2026-37943","description":"deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5  are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.","status":"published","published":"2026-06-18T20:01:31Z","modified":"2026-06-22T15:11:26Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical"}],"updated_at":"2026-11-02T18:20:34.745289Z"}],"ghsa":[{"id":"GHSA-9v98-6g37-x9g6","title":"deepstream is vulnerable to prototype pollution","description":"### Impact\nPrototype pollution in deepstream server v \u003c=10.0.4. Potential privilege escalation from any authenticated user with write permission to any record.\n\n### Patches\nYes, upgrade to v10.0.5\n\n### Workarounds\nFilter out all messages containing the path `__proto__`, `constructor`, `prototype`, **before they reach the server's message pipeline**","status":"published","published":"2026-06-26T21:03:59Z","modified":"2026-06-26T21:04:00Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:40:34.713036Z"}],"nvd":[{"id":"CVE-2026-49252","description":"deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5  are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.","status":"published","published":"2026-06-18T21:16:29.643Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical","assessor":"secondary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:12:24.912854Z"}],"osv":[{"id":"CVE-2026-49252","title":"deepstream is vulnerable to prototype pollution","description":"deepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5  are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.","status":"published","published":"2026-06-18T20:01:31.307Z","modified":"2026-10-28T02:31:03.48233225Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:45:07.060148Z"},{"id":"GHSA-9v98-6g37-x9g6","title":"deepstream is vulnerable to prototype pollution","description":"### Impact\nPrototype pollution in deepstream server v \u003c=10.0.4. Potential privilege escalation from any authenticated user with write permission to any record.\n\n### Patches\nYes, upgrade to v10.0.5\n\n### Workarounds\nFilter out all messages containing the path `__proto__`, `constructor`, `prototype`, **before they reach the server's message pipeline**","status":"published","published":"2026-06-26T21:03:59Z","modified":"2026-09-10T03:50:55.381071193Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:44.225359Z"}]}}