CVE-2026-49252

deepstream is vulnerable to prototype pollution

Published Jun 18, 2026 CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9v98-6g37-x9g6 deepstream is vulnerable to prototype pollution
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Deepstreamio
Deepstreamio deepstream.io
Vendors & Products Deepstreamio
Deepstreamio deepstream.io
Type Values Removed Values Added
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.
Title deepstream is vulnerable to prototype pollution
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 22, 2026, 3:11 PM
Reserved
May 28, 2026, 2:33 PM
Status
Deferred
Published
Jun 18, 2026, 9:16 PM
Modified
Oct 26, 2026, 11:10 AM