GHSA-9643-4qgh-g8mx

Source

https://github.com/advisories/GHSA-9643-4qgh-g8mx

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9643-4qgh-g8mx/GHSA-9643-4qgh-g8mx.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9643-4qgh-g8mx

Aliases

CVE-2026-56669

Published

2026-09-23T21:54:50Z

Modified

2026-09-23T22:00:04Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

elysia has Inefficient Algorithmic Complexity and Interpretation Conflict

Details

Elysia v1.4.28 is vulnerable to denial-of-service attacks due to CPU exhaustion in the form data normalization code.

Elysia uses getAll to retrieve value from FormData. It is called directly relative to the total number of key-value pairs in the form data. The total amount of work the for loop has to do grows quadratically, so doubling the number of unique key-value pairs quadruples the amount of work. In the above PoC, each .getAll call scans through all of the n key-value pairs in the form data. Because there are n unique keys in the form data, there are .getAll calls, so in total the form data normalizer has to scan n x n key-value pairs.

Impact

Endpoints using multipart/form-data

Patches

1.4.29

Workarounds

no 100% confirm workaround beside updating the patch

Database specific

{
    "cwe_ids":  [
        "CWE-407",
        "CWE-436"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-23T21:54:50Z",
    "nvd_published_at":  "2026-07-08T21:16:50Z",
    "severity":  "HIGH"
}

References

Affected packages

npm / elysia

Package

Name: elysia; View open source insights on deps.dev
Purl: pkg:npm/elysia

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.4.29

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9643-4qgh-g8mx/GHSA-9643-4qgh-g8mx.json"