Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M
CVE-2026-32886Parse Server's Cloud function dispatch crashes server via prototype chain traversal
High 8.2
In plain English
A high-severity prototype pollution in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.24 and 8.6.47, remote clients can crash the Parse Server process by calling a cloud function endpoint with a crafted function name that traverses the JavaScript prototype chain of a registered cloud function handler, causing a stack overflow. The fix in versions 9.6.0-alpha.24 and 8.6.47 restricts property lookups during cloud function name resolution to own properties only, preventing prototype chain traversal from stored function handlers. There is no known workaround.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.24 | GHSA-4263-jgmp-7pf4 |
| npm | parse-server | 8.6.47 | GHSA-4263-jgmp-7pf4 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | >= 9.0.0, < 9.6.0-alpha.24< 8.6.47 |
Weakness: CWE-1321 · Vector: 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
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-4263-jgmp-7pf4 x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10210 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10211 x_refsource_MISC