GitHub Advisoryadvisory · npm

GHSA-827p-g5x5-h86c Parse Server LiveQuery subscription with invalid regular expression crashes server

MEDIUM Published 2026-03-17 Modified 2026-03-19 Official page ↗
Aliases
CVE-2026-32770
Ecosystem
npm
Packages
parse-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-248
Reviewed
2026-03-17

Affected packages

• npm parse-server: >= 9.0.0, < 9.6.0-alpha.19 → fixed in 9.6.0-alpha.19 • npm parse-server: < 8.6.43 → fixed in 8.6.43

Description

Impact A remote attacker can crash the Parse Server by subscribing to a LiveQuery with an invalid regular expression pattern. The server process terminates when the invalid pattern reaches the regex engine during subscription matching, causing denial of service for all connected clients. Patches The fix validates regular expression patterns at subscription time, rejecting invalid patterns before they are stored. Additionally, a defense-in-depth try-catch prevents any subscription matching error from crashing the server process. Workarounds Disable LiveQuery if it is not needed.

Related

Alias · CVE (1)

  • CVE-2026-32770 Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. vulnerability

Weakness · CWE (1)

  • CWE-248 Uncaught Exception weakness

References