CVE-2026-47138— Parse Server: Pre-authentication denial of service via client version header regex backtracking
Quick assessment
Affected
parse-community parse-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Parse Platform Parse Server是Parse Platform组织开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Platform Parse Server 8.6.77之前版本和9.9.1-alpha.1之前版本存在资源管理错误漏洞，该漏洞源于请求标头解析器中存在多项式回溯问题，可能导致未经身份验证的攻击者通过发送包含恶意客户端SDK版本字段的HTTP请求，消耗Node.js工作进程大量同步CPU资源。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| parse-community | parse-server | < 8.6.77 |
affected |
>= 9.0.0, < 9.9.1-alpha.1 |
affected |
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I. Basic Information for CVE-2026-47138
Vulnerability Information
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Vulnerability Title
Parse Server: Pre-authentication denial of service via client version header regex backtracking
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server is 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. The parsing runs before session authentication and before rate limiting on every /parse/* request, so the request consumes seconds to minutes of synchronous CPU on a Node.js worker before any access control evaluates it. A small number of concurrent requests can saturate a worker; a single large request via the body-field variant can pin a worker for minutes. Production deployments running the default configuration are affected. This issue has been patched in versions 8.6.77 and 9.9.1-alpha.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Platform Parse Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Platform Parse Server是Parse Platform组织开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Platform Parse Server 8.6.77之前版本和9.9.1-alpha.1之前版本存在资源管理错误漏洞，该漏洞源于请求标头解析器中存在多项式回溯问题，可能导致未经身份验证的攻击者通过发送包含恶意客户端SDK版本字段的HTTP请求，消耗Node.js工作进程大量同步CPU资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| parse-community | parse-server | < 8.6.77 | - |
|
II. Public POCs for CVE-2026-47138
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-47138 (2)
Vendor Advisories for CVE-2026-47138 (1)
Same Patch Batch · parse-community · 2026-06-12 · 6 CVEs total
| CVE-2026-53726 | Parse Server: Relation `$relatedTo` query bypasses `protectedFields` and owning-object ACL | |
| CVE-2026-53724 | Parse Server: Stored XSS via trailing-dot filename bypassing file upload extension blockli | |
| CVE-2026-53725 | Parse Server: Endpoints `/login` and `/verifyPassword` disclose MFA secrets and protected | |
| CVE-2026-47248 | Parse Server: GraphQL "Did you mean" validation suggestions disclose schema to unauthentic | |
| CVE-2026-50008 | Parse Server: Server option routeAllowList is bypassable through batch sub-requests |
IV. Related Vulnerabilities
Same product: parse-server
-
CVE-2026-66009
Parse Server 9.0.0 Information Disclosure via GraphQL Error -
CVE-2026-66008
Parse Server 9.0.0 Information Disclosure via GraphQL Error -
CVE-2026-64627
Parse Server 9.0.0 Schema Disclosure via GraphQL Variable Co -
CVE-2026-61448
Parse Server 9.0.0 Stored XSS via malformed Content-Type -
CVE-2026-57481
Parse Server: LiveQuery discloses object data to a subscribe
Same vendor: parse-community
-
CVE-2026-66009
Parse Server 9.0.0 Information Disclosure via GraphQL Error -
CVE-2026-66008
Parse Server 9.0.0 Information Disclosure via GraphQL Error -
CVE-2026-64627
Parse Server 9.0.0 Schema Disclosure via GraphQL Variable Co -
CVE-2026-61448
Parse Server 9.0.0 Stored XSS via malformed Content-Type -
CVE-2026-57481
Parse Server: LiveQuery discloses object data to a subscribe
Same weakness: CWE-1333
-
CVE-2026-85062
Colord: Slow rejection of oversized malformed color strings -
CVE-2024-58379
nodemailer before 6.9.9 ReDoS via attachDataUrls parameter -
CVE-2026-80206
NLTK 3.10.2 Regular Expression Denial of Service via tgrep -
CVE-2026-80205
NLTK before 3.10.0 ReDoS via Text.findall() unvalidated rege -
CVE-2026-79770
Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
V. Comments for CVE-2026-47138
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