CVE-2026-32770
highpriority · track · 30EPSS 0.006 · 47 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-827p-g5x5-h86cParse Server LiveQuery subscription with invalid regular expression crashes server2026-03-17ghsa · osvUS
### 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.
- BIT-parse-2026-32770Parse Server: LiveQuery subscription with invalid regular expression crashes server2026-03-20vendor · osvUS
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.
also known as (5)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://github.com/parse-community/parse-server/pull/10197cnnvd
- https://github.com/parse-community/parse-server/pull/10199cnnvd
- https://github.com/parse-community/parse-server/releasesPatchcnnvd
- https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86ccnnvd
- https://github.com/parse-community/parse-server/pull/10197enisa_euvd
- https://github.com/parse-community/parse-server/pull/10199enisa_euvd
- https://github.com/parse-community/parse-server/security/advisories/GHSA-827p-g5x5-h86cenisa_euvd
- https://github.com/parse-community/parse-server/pull/10197Issue Trackingnvd
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