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Vulnerability record · CVE-2026-56669 · published 8 July 2026

CVE-2026-56669: Interpretation conflict vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.63% · top 51.9% CWE-407 · CWE-407CWE-436 · Interpretation conflict Deferred
7.5CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
10 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://gist.github.com/jviide/ea040eabe7bac058326174e2cd42dfd9
https://github.com/elysiajs/elysia/commit/8358ff9efbcedf9534995f5977f26b9ceab59329
https://github.com/elysiajs/elysia/releases/tag/1.4.29
https://github.com/elysiajs/elysia/security/advisories/GHSA-9643-4qgh-g8mx

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Source: NIST National Vulnerability Database (record CVE-2026-56669), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.