CVE-2026-47138Network attack vector

Pre-authentication service hang via client-version regex backtracking

Published Jun 12, 2026 · Updated Jun 12, 2026

Denial of service in Parse Server 8.6.76 and earlier and 9.0.0 through 9.9.1-alpha.0 allows remote attackers to exhaust worker CPU. Request middleware passes the client-version header or body field to the ClientSDK parser, whose version regex performs polynomial backtracking. A public Application ID reaches this parser before authentication and rate limiting; one large request can pin a worker for minutes in default deployments.

CVSS severity8.7
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Parse Server 8.6.76 and earlier and 9.0.0 through 9.9.1-alpha.0 allows remote attackers to exhaust worker CPU. Request middleware passes the client-version header or body field to the ClientSDK parser, whose version regex performs polynomial backtracking. A public Application ID reaches this parser before authentication and rate limiting; one large request can pin a worker for minutes in default deployments.

The record

CVE
CVE-2026-47138
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.6.77
  2. Affected versionversion=>= 9.0.0, < 9.9.1-alpha.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.77; version=>= 9.0.0, < 9.9.1-alpha.1

Published CVSS scores

7.5GitLabCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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