Most recent entries from all

BIT-parse-2026-30925 — Parse Server affected by Regular Expression Denial of Service (ReDoS) via `$regex` query in LiveQuery

2026-10-09T23:11:39.095363+00:00

Affected: Bitnami: parse

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0 and 8.6.11, a malicious client can subscribe to a LiveQuery with a crafted $regex pattern that causes catastrophic backtracking, blocking the Node.js event loop. This makes the entire Parse Server unresponsive, affecting all clients. Any Parse Server deployment with LiveQuery enabled is affected. The attacker only needs the application ID and JavaScript key, both of which are public in client-side apps. This only affects LiveQuery subscription matching, which evaluates regex in JavaScript on the Node.js event loop. Normal REST and GraphQL queries are not affected because their regex is evaluated by the database engine. This vulnerability is fixed in 9.5.0 and 8.6.11.

EUVD-2026-275180

2026-10-09T23:11:39.095431+00:00

EUVD-2026-275180

fkie_cve-2026-30925

2026-10-09T23:11:39.095447+00:00

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0-alpha.14 and 8.6.11, a malicious client can subscribe to a LiveQuery with a crafted $regex pattern that causes catastrophic backtracking, blocking the Node.js event loop. This makes the entire Parse Server unresponsive, affecting all clients. Any Parse Server deployment with LiveQuery enabled is affected. The attacker only needs the application ID and JavaScript key, both of which are public in client-side apps. This only affects LiveQuery subscription matching, which evaluates regex in JavaScript on the Node.js event loop. Normal REST and GraphQL queries are not affected because their regex is evaluated by the database engine. This vulnerability is fixed in 9.5.0-alpha.14 and 8.6.11.

GHSA-mf3j-86qx-cq5j — Parse Server has Regular Expression Denial of Service (ReDoS) via `$regex` query in LiveQuery

2026-10-09T23:11:39.095473+00:00

Affected: npm: parse-server

### Impact

A malicious client can subscribe to a LiveQuery with a crafted `$regex` pattern that causes catastrophic backtracking, blocking the Node.js event loop. This makes the entire Parse Server unresponsive, affecting all clients. Any Parse Server deployment with LiveQuery enabled is affected. The attacker only needs the application ID and JavaScript key, both of which are public in client-side apps.

This only affects LiveQuery subscription matching, which evaluates regex in JavaScript on the Node.js event loop. Normal REST and GraphQL queries are not affected because their regex is evaluated by the database engine.

### Patches

Regex evaluation in LiveQuery subscription matching now runs in an isolated VM context with a configurable timeout via a new Parse Server option `liveQuery.regexTimeout, with defaults 100 ms. A regex that exceeds the timeout is treated as non-matching.

The protection adds approximately 50 microseconds of overhead per regex evaluation. For most applications this is negligible, but it can add up if there is a very large number of LiveQuery subscriptions that use `$regex` on the same class. For example, 10,000 concurrent regex subscriptions would add approximately 500ms of processing time per object save event on that class. Set `liveQuery.regexTimeout: 0` to disable the protection and use native regex evaluation without overhead.

### Workarounds

Use the `beforeSubscribe` Cloud Code hook to reject any LiveQuery subscription that contains a `$r…