Parse Server: LiveQuery subscription with invalid regular expression crashes server
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-32770
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 16:39 UTC · Revision 1
Source evidence
Parse Server: LiveQuery subscription with invalid regular expression crashes server
core-osv · Original sourcePublished 18 Mar 2026, 21:37 UTC
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.
osv:CVE-2026-32770
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-32770",
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"title": "Parse Server: LiveQuery subscription with invalid regular expression crashes server",
"summary": "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.",
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"modified": "2026-10-28T02:30:30.474440447Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32770.json",
"https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86c",
"https://nvd.nist.gov/vuln/detail/CVE-2026-32770",
"https://github.com/parse-community/parse-server/pull/10197",
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"source_id": "core-osv",
"document_id": 497495,
"published_at": "2026-03-18T21:37:36.47+00:00"
}