Prototype Pollution CVE-2026-32886
HIGH
GHSA-4263-jgmp-7pf4
Lifecycle Timeline
3DescriptionNVD
Impact
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.
Patches
The fix restricts property lookups during cloud function name resolution to own properties only, preventing prototype chain traversal from stored function handlers.
Workarounds
There is no known workaround.
AnalysisAI
Parse Server is vulnerable to denial of service when remote attackers craft malicious cloud function names that exploit prototype chain traversal, allowing them to trigger stack overflows and crash the server process. The vulnerability stems from improper property lookup restrictions during function name resolution. …
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RemediationAI
Within 24 hours: Inventory all Parse Server instances and cloud function endpoints; assess exposure to external/untrusted traffic. Within 7 days: Apply available vendor patch to all affected Parse Server deployments in non-production environments and validate functionality. …
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External POC / Exploit Code
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