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CVE-2026-56669— Elysia: Inefficient Algorithmic Complexity and Interpretation Conflict

CVSS 7.5 · High

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-56669

Vulnerability Information
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Vulnerability Title
Elysia: Inefficient Algorithmic Complexity and Interpretation Conflict
Source: NVD (National Vulnerability Database)
Vulnerability Description
Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication. Prior to 1.4.29, Elysia uses getAll in form data normalization for multipart/form-data endpoints, causing the amount of work to grow quadratically with the number of unique key-value pairs and allowing CPU exhaustion. This issue is fixed in version 1.4.29.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
elysiajselysia < 1.4.29 -

II. Public POCs for CVE-2026-56669

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7113 chars
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III. Intelligence Information for CVE-2026-56669

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Vendor Advisories for CVE-2026-56669 (1)

Proof of Concept for CVE-2026-56669 (1)

Vendor Pages for CVE-2026-56669 (1)

IV. Related Vulnerabilities

Same product: elysia
Same vendor: elysiajs
Same weakness: CWE-407

V. Comments for CVE-2026-56669

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