CVE-2026-49252: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in deepstreamIO deepstream.io
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.
AI Analysis
Technical Summary
CVE-2026-49252 describes a Prototype Pollution vulnerability in deepstream.io, a server enabling data synchronization, messaging, and RPCs at scale. Versions before 10.0.5 allow improper modification of object prototype attributes, which can be exploited by any authenticated user with write access to escalate privileges. The vulnerability is addressed in version 10.0.5. The CVSS 3.1 score of 9.9 reflects network attack vector, low attack complexity, required privileges, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can lead to privilege escalation from any authenticated user with write permission to any record, potentially compromising the confidentiality, integrity, and availability of the system. This could allow attackers to perform unauthorized actions or access sensitive data within deepstream.io environments running vulnerable versions.
Mitigation Recommendations
A fix is available in deepstream.io version 10.0.5. Users should upgrade to version 10.0.5 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official fix.
CVE-2026-49252: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in deepstreamIO deepstream.io
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.
CVSS v3.1
Score 9.9critical
Affected software
pkg:github/deepstreamio/deepstream.ioRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49252 describes a Prototype Pollution vulnerability in deepstream.io, a server enabling data synchronization, messaging, and RPCs at scale. Versions before 10.0.5 allow improper modification of object prototype attributes, which can be exploited by any authenticated user with write access to escalate privileges. The vulnerability is addressed in version 10.0.5. The CVSS 3.1 score of 9.9 reflects network attack vector, low attack complexity, required privileges, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can lead to privilege escalation from any authenticated user with write permission to any record, potentially compromising the confidentiality, integrity, and availability of the system. This could allow attackers to perform unauthorized actions or access sensitive data within deepstream.io environments running vulnerable versions.
Mitigation Recommendations
A fix is available in deepstream.io version 10.0.5. Users should upgrade to version 10.0.5 or later to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-28T14:33:01.179Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3456d1f198dc38c18207e6
Added to database: 06/18/2026, 20:36:33 UTC
Last enriched: 06/25/2026, 21:17:25 UTC
Last updated: 08/01/2026, 19:18:00 UTC
Views: 120
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