Denial of Service Vulnerability in Parse Server by Parse Community
CVE-2026-47138

8.7HIGH

Key Information:

Vendor

Parse-community

Status
Parse-server
Vendor
CVE Published:
12 June 2026

What is CVE-2026-47138?

Parse Server, an open-source backend platform, has a vulnerability that allows unauthenticated attackers with knowledge of a public Parse Application ID to send specially crafted HTTP requests. This condition results in polynomial backtracking during request-header parsing, leading to excessive CPU consumption on Node.js workers. The issue can severely impact the availability of the server by delaying access control evaluations and exhausting worker resources. Subsequent patches were introduced in versions 8.6.77 and 9.9.1-alpha.1 to safeguard against this attack vector. Deployments with default configurations are susceptible, making it essential for users to upgrade to the patched versions to prevent potential disruption of service.

Affected Version(s)

parse-server < 8.6.77 < 8.6.77

parse-server >= 9.0.0, < 9.9.1-alpha.1 < 9.0.0, 9.9.1-alpha.1

References

https://github.com/parse-community/parse-server/security/...
x_refsource_CONFIRM
https://github.com/parse-community/parse-server/pull/10463
x_refsource_MISC
https://github.com/parse-community/parse-server/pull/10464
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.