High 8.2Published Mar 9, 2026

CVE-2026-30925Parse Server affected by Regular Expression Denial of Service (ReDoS) via `$regex` query in LiveQuery

Updated under an hour ago (Oct 27, 2026, 11:00 AM ET)

Does this affect you?

It affects parse-community parse-server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for parse-community parse-server

Exploited in the last 30 days

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0-alpha.14 and 8.6.11, a malicious client can subscribe to a LiveQuery with a crafted $regex pattern that causes catastrophic backtracking, blocking the Node.js event loop. This makes the entire Parse Server unresponsive, affecting all clients. Any Parse Server deployment with LiveQuery enabled is affected. The attacker only needs the application ID and JavaScript key, both of which are public in client-side apps. This only affects LiveQuery subscription matching, which evaluates regex in JavaScript on the Node.js event loop. Normal REST and GraphQL queries are not affected because their regex is evaluated by the database engine. This vulnerability is fixed in 9.5.0-alpha.14 and 8.6.11.

CVSS: 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

parse-community parse-server parse_community:parse_server (from the name)	from 9.0.0 < 9.5.0-alpha.14; before 8.6.11	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.11; from 9.0.0 before 9.5.0; 9.5.0; 9.5.0; 9.5.0; 9.5.0; 9.5.0; 9.5.0; and 7 more ranges	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mf3j-86qx-cq5j	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/parse-community/parse-server/releases/tag/8.6.11	x-refsource-misc, product, release-notes
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.14	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.