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CVE-2026-49252 — Vulnerability in @deepstream/server — CVE Details

CRITICAL

deepstream is vulnerable to prototype pollution

Published June 26, 2026Updated September 10, 2026Source: osv

Summary

### Impact Prototype pollution in deepstream server v <=10.0.4. Potential privilege escalation from any authenticated user with write permission to any record. ### Patches Yes, upgrade to v10.0.5 ### Workarounds Filter out all messages containing the path `__proto__`, `constructor`, `prototype`, **before they reach the server's message pipeline**

Advisory Timeline

  • First published June 26, 2026 (108 days ago).
  • Last revised September 10, 2026 — 75 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @deepstream/server to 10.0.5 or later
npm install @deepstream/server@10.0.5

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@deepstream/server
npm
All versions10.0.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-1321
    Prototype PollutionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.9 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

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

References

Frequently Asked Questions

What is CVE-2026-49252?
deepstream is vulnerable to prototype pollution This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.9/10).
How do I check if my project is affected by CVE-2026-49252?
CVE-2026-49252 affects @deepstream/server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-49252 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.9

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-9v98-6g37-x9g6

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