CVE-2026-49252

deepstream is vulnerable to prototype pollution

CVSS 9.9 CRITICALEPSS 0.3%CWE-1321

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

18 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Affected products

deepstreamIO · deepstream.io

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References

https://github.com/deepstreamIO/deepstream.io/commit/54b8e2958a98df444b5b5d9a66e22872afd84e44 https://github.com/deepstreamIO/deepstream.io/security/advisories/GHSA-9v98-6g37-x9g6