Critical 9.9Published Jun 18, 2026

CVE-2026-49252deepstream is vulnerable to prototype pollution

Updated under an hour ago (Oct 26, 2026, 4:50 PM ET)

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It affects deepstreamIO deepstream.io. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for deepstreamIO deepstream.io

Exploited in the last 30 days

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: 9.9 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Weakness (CWE): CWE-1321
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jun 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

deepstreamIO deepstream.io deepstreamio:deepstream.io (from the name)	before 10.0.5	CNA record

References

References

https://github.com/deepstreamIO/deepstream.io/security/advisories/GHSA-9v98-6g37-x9g6	x-refsource-confirm
https://github.com/deepstreamIO/deepstream.io/commit/54b8e2958a98df444b5b5d9a66e22872afd84e44	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.