CVE-2026-32770

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0 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 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.

How to fix CVE-2026-32770

To remediate CVE-2026-32770, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.43 or later
• —upgrade to 9.6.0-alpha.19 or later

Is CVE-2026-32770 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.43, >= 9.0.0, < 9.6.0
• >= 9.0.0, < 9.6.0-alpha.19

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-32770
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/pull/10197
• WEBgithub.com/parse-community/parse-server/pull/10199