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CVE-2026-49252— deepstream is vulnerable to prototype pollution

Quick assessment

Affected
deepstreamIO deepstream.io
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DeepstreamIO DeepstreamIO是DeepstreamIO组织开源的一个实时消息和数据同步服务器。 DeepstreamIO 10.0.5之前版本存在输入验证错误漏洞，该漏洞源于原型污染，可能导致任何具有写入权限的已认证用户权限提升。

CVSS 9.9 · Critical EPSS 0.47% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
deepstreamIO deepstream.io < 10.0.5 affected
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I. Basic Information for CVE-2026-49252

Vulnerability Information
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Vulnerability Title
deepstream is vulnerable to prototype pollution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
DeepstreamIO 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DeepstreamIO DeepstreamIO是DeepstreamIO组织开源的一个实时消息和数据同步服务器。 DeepstreamIO 10.0.5之前版本存在输入验证错误漏洞，该漏洞源于原型污染，可能导致任何具有写入权限的已认证用户权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
deepstreamIO deepstream.io < 10.0.5 -

II. Public POCs for CVE-2026-49252

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7624 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-49252

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Patches & Fixes for CVE-2026-49252 (1)

Vendor Advisories for CVE-2026-49252 (1)

IV. Related Vulnerabilities

Same product: deepstream.io
Same vendor: deepstreamIO
Same weakness: CWE-1321

V. Comments for CVE-2026-49252

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