CVE-2026-32770
Parse Server: LiveQuery subscription with invalid regular expression crashes server
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.19 and 8.6.43, 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. The fix in 9.6.0-alpha.19 and 8.6.43 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. As a workaround, disable LiveQuery if it is not needed.
| CWE | CWE-248 |
| Vendor | parse-community |
| Product | parse-server |
| Published | Mar 18, 2026 |
| Last Updated | Mar 19, 2026 |
Get instant alerts for parse-community parse-server
Be the first to know when new medium vulnerabilities affecting parse-community parse-server are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H