Vulnerability in Parse-Community Parse-Server
CVE-2026-32770
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.
EPSS: 0.005 (42.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Parse-community Parse-server — versions >= 9.0.0, < 9.6.0-alpha.19, < 8.6.43
- Parseplatform Parse-server — versions 9.6.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2026-32770?
- CVE-2026-32770 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under CWE-248. CVSS score: 5.9/10. Published 2026-03-18.
- How severe is CVE-2026-32770?
- Medium severity. CVSS v3 base score is 5.9 out of 10.