medium5.9
CVE-2026-32770
Parse Server LiveQuery subscription with invalid regular expression crashes server
Impact
### 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | parse-server | >= 9.0.0, < 9.6.0-alpha.19 | 9.6.0-alpha.19 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Parseplatform | Parse-Server | before 8.6.43 from 9.0.0 before 9.6.0 Version 9.6.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/parse-community/parse-server/pull/10197
- https://github.com/parse-community/parse-server/pull/10199
- https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86c
- https://github.com/advisories/GHSA-827p-g5x5-h86c
- https://nvd.nist.gov/vuln/detail/CVE-2026-32770