High 8.8Published Sep 21, 2026

CVE-2026-63116deepstream: PATCH_MULTI action bypasses Valve permission system allowing unauthorized record writes

Updated under an hour ago (2026-10-19 06:25 UTC)

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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. From 10.1.0 until 10.1.1, src/services/permission/valve/rules-map.ts omits RECORD_ACTION.PATCH_MULTI from RULES_MAP. When an authenticated user sends a PATCH_MULTI record operation while permission.type is config, getRulesForMessage returns a null rule specification and ConfigPermission.canPerformAction treats the missing specification as an unconditional allow instead of applying RULE_TYPES.WRITE. Any authenticated user can therefore modify arbitrary protected records, corrupt application state, or cause service disruption; deployments using the default permission type none already allow all operations and are not additionally affected. This issue is fixed in version 10.1.1.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-862
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: Sep 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

deepstreamIO deepstream.io deepstreamio:deepstream.io (from the name)	from 10.1.0, < 10.1.1	CNA record

References

https://github.com/deepstreamIO/deepstream.io/security/advisories/GHSA-89vx-jh4q-vg3wx-refsource-confirm
https://github.com/deepstreamIO/deepstream.io/commit/1c2adde6581c53ef47e204364bc740bc3c2e2e2ax-refsource-misc
https://github.com/deepstreamIO/deepstream.io/releases/tag/v10.1.1x-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.