🛡️ CVE-2026-49252 — server

🔴 CVSS 9.9 — Critical ✅ No Known Exploit CWE-1321 NVD
9.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

deepstream is vulnerable to prototype pollution

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability low.

Weakness class

CVE-2026-49252 is classified as CWE-1321: Prototype Pollution. Attacker input can modify an object prototype, changing behaviour for objects across the application.

Affected software

CVE-2026-49252 is recorded against 2 packages.

  • @deepstream/server
  • unknown

Timeline and source

Published on 26 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

Details

Severity CRITICAL
CVSS Score 9.9
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CWE CWE-1321
Public Exploit ✅ No
Source NVD
Published 2026-06-26
Updated 2026-08-12
Modified 2026-06-26
Fix URL N/A

Affected Packages

Software From version Fixed in
@deepstream/server — —
unknown — —

Exploit Protection

Are you running server?

CVE-2026-49252 carries CVSS 9.9 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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