What is CVE-2026-56669?

CVE-2026-56669 is a high-severity vulnerability in Elysiajs Elysia, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-56669?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Elysiajs Elysia

CVE-2026-56669

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.

EPSS: 0.004 (29.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Elysiajs Elysia — versions < 1.4.29

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-56669?: CVE-2026-56669 is a high-severity vulnerability in Elysiajs Elysia, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-56669?: High severity. CVSS v3 base score is 7.5 out of 10.