CVE-2026-32770

Description

### 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.

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 0.0%, 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