CVE-2026-63116

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

Product@deepstream/server

PublishedSep 21, 2026

First seenSep 21, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

@deepstream/server10.1.1 or later

Affected products

Product	Affected versions	Fixed in
@deepstream/servernpm	10.1.0 ≤ v < 10.1.1	10.1.1

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