CVE-2026-32770
published 2026-03-18CVE-2026-32770: 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…
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.55%
41.8th percentile
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.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 8.6.43 | 8.6.43 |
| parse-community | parse-server | — | — |
| parse-community | parse-server | >= 0 < 8.6.43 | 8.6.43 |
| parse-community | parse-server | >= 9.0.0 < 9.6.0-alpha.19 | 9.6.0-alpha.19 |
| parseplatform | parse-server | < 8.6.43 | 8.6.43 |
| parseplatform | parse-server | — | — |
| parseplatform | parse-server | >= 9.0.0 < 9.6.0 | 9.6.0 |
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GHSA
Parse Server LiveQuery subscription with invalid regular expression crashes server
ghsa·2026-03-17
CVE-2026-32770 [MEDIUM] CWE-248 Parse Server LiveQuery subscription with invalid regular expression crashes server
Parse Server LiveQuery subscription with invalid regular expression crashes server
### 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.
OSV
Parse Server LiveQuery subscription with invalid regular expression crashes server
osv·2026-03-17
CVE-2026-32770 [MEDIUM] Parse Server LiveQuery subscription with invalid regular expression crashes server
Parse Server LiveQuery subscription with invalid regular expression crashes server
### 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.
No detection rules found.
No public exploits indexed.
2026-03-18
Published