Parse Server LiveQuery subscription with invalid regular expression crashes server
### 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-32770US | high7.5 | — | ||
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 Se… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/parse-community/parse-serverPACKAGE
- https://github.com/parse-community/parse-server/pull/10197WEB
- https://github.com/parse-community/parse-server/pull/10199WEB
- https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86cWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-32770ADVISORY
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