Which versions of Prototype Pollution are affected by CVE-2026-32886?

Parse Server deployments are vulnerable to denial-of-service attacks where remote attackers can crash the application by exploiting cloud function name resolution.. A patch is available.

How to fix or mitigate CVE-2026-32886?

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. Within 30 days: Deploy patched versions to all production systems, prioritizing customer-facing and critical business services.

Prototype Pollution CVE-2026-32886

HIGH

Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)

2026-03-17 https://github.com/parse-community/parse-server

GHSA-4263-jgmp-7pf4

Prototype Pollution Denial Of Service

Lifecycle Timeline

Analysis Generated

Mar 17, 2026 - 20:30 vuln.today

Patch released

Mar 17, 2026 - 20:30 nvd

Patch available

CVE Published

Mar 17, 2026 - 17:58 nvd

HIGH

DescriptionCVE.org

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. A patch is available that limits lookups to own properties only.

Technical ContextAI

A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users. This vulnerability is classified as Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321).

RemediationAI

A vendor patch is available — apply it immediately. Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.