Vulnerability · Published Oct 30, 2026 · Assigned by VulnCheck

CVE-2026-119569Parse Server 9.0.0 before 9.10.5-alpha.9 Prototype Pollution Denial of Service

Medium 5.3

In plain English

A medium-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 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 68.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Parse Server before 8.6.108 and 9.0.0 before 9.10.5-alpha.9 contains a prototype pollution vulnerability because user-controlled keys are expanded into objects without own-property checks. Clients with class write access can send dot notation field keys or ACL entry names matching built-in object members to corrupt built-in functions, causing all requests to fail until server restart.

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	9.0.0 – before 9.10.5-alpha.9
parse-community	parse-server	0 – before 8.6.108

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-rx55-fw4j-pvpx) vendor-advisory
VulnCheck Advisory: Parse Server 9.0.0 before 9.10.5-alpha.9 Prototype Pollution Denial of Service third-party-advisory