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CVE-2026-47138 parse-community CVE debrief

CVE-2026-47138 is a HIGH-severity vulnerability in Parse Server, an open-source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.77 and 9.9.1-alpha.1, an unauthenticated attacker who knows a publicly-known Parse Application ID can submit a single HTTP request whose client SDK version field contains adversarial input that triggers polynomial backtracking in a request-header parser. This issue has been patched in versions 8.6.77 and 9.9.1-alpha.1.

Vendor
parse-community
Product
parse-server
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Users of Parse Server, especially those running production deployments with the default configuration, should be aware of this vulnerability and take action to patch their installations.

Technical summary

The vulnerability allows an unauthenticated attacker to submit a malicious HTTP request that triggers polynomial backtracking in the request-header parser, consuming significant CPU resources and potentially leading to denial-of-service (DoS) attacks.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Parse Server version 8.6.77 or 9.9.1-alpha.1 or later.
  • Review and adjust the configuration of your Parse Server installation to prevent exploitation.

Evidence notes

The vulnerability is patched in versions 8.6.77 and 9.9.1-alpha.1. Users can refer to the official CVE record [cve-org] and NVD detail [nvd] for more information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47138 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47138

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47138 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47138

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.