CVE-2026-49252Network attack vector

Authenticated privilege escalation via crafted record paths

Published Jun 18, 2026 · Updated Jun 18, 2026

Prototype pollution in deepstream.io before 10.0.5 allows remote authenticated users to escalate privileges through a crafted record path. The record update pipeline passes attacker-controlled paths to json-path setValue, which traverses proto, constructor, or prototype segments and writes into object prototypes. Any authenticated account with write permission to any record can reach the flaw, allowing unauthorized changes beyond that account's intended permissions.

CVSS severity9.9
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in deepstream.io before 10.0.5 allows remote authenticated users to escalate privileges through a crafted record path. The record update pipeline passes attacker-controlled paths to json-path setValue, which traverses proto, constructor, or prototype segments and writes into object prototypes. Any authenticated account with write permission to any record can reach the flaw, allowing unauthorized changes beyond that account's intended permissions.

The record

CVE
CVE-2026-49252
Published
Jun 18, 2026
Updated
Jun 18, 2026
Vendor
deepstreamHub
Product
deepstream.io
Classifications
CWE-1321, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 10.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

deepstreamHub · deepstream.ioversion=< 10.0.5

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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