High
Parse Server: Denial of service via exponential-time processing of deeply nested query operators
Type: advisorySources: OSV
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.12 and 8.6.82, deeply nested $or, $and, and $nor query condition operators in the REST API or LiveQuery query handling could trigger exponential-time processing in the internal query-traversal helper and block the Node.js event loop. This issue is fixed in versions 9.9.1-alpha.12 and 8.6.82.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-57480
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 04:00 UTC · Revision 1
Source evidence
Parse Server: Denial of service via exponential-time processing of deeply nested query operators
core-osv · Original sourcePublished 8 Jul 2026, 20:53 UTC
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.12 and 8.6.82, deeply nested $or, $and, and $nor query condition operators in the REST API or LiveQuery query handling could trigger exponential-time processing in the internal query-traversal helper and block the Node.js event loop. This issue is fixed in versions 9.9.1-alpha.12 and 8.6.82.
osv:CVE-2026-57480
Complete source record
{
"id": "2c1613f5d8619cdd114f4a6651434815ab1e4fb1f64b1d464a808b8d09de45fa",
"url": "https://osv.dev/vulnerability/CVE-2026-57480",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Parse Server: Denial of service via exponential-time processing of deeply nested query operators",
"summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.12 and 8.6.82, deeply nested $or, $and, and $nor query condition operators in the REST API or LiveQuery query handling could trigger exponential-time processing in the internal query-traversal helper and block the Node.js event loop. This issue is fixed in versions 9.9.1-alpha.12 and 8.6.82.",
"evidence": "osv:CVE-2026-57480",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-57480",
"aliases": [
"BIT-parse-2026-57480",
"CVE-2026-57480",
"GHSA-cgxm-vr2f-6fj8"
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
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"modified": "2026-10-28T02:30:33.023125515Z",
"provider": "osv",
"references": [
"https://github.com/parse-community/parse-server/releases/tag/8.6.82",
"https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.12",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57480.json",
"https://github.com/parse-community/parse-server/security/advisories/GHSA-cgxm-vr2f-6fj8",
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"source_id": "core-osv",
"document_id": 500197,
"published_at": "2026-07-08T20:53:21.307+00:00"
}