---
id: CVE-2026-49250
title: >-
  Conform, a type-safe form validation library, allows the parsing of nested
  objects in the form of object.property
summary: >-
  Conform, a type-safe form validation library, allows the parsing of nested
  objects in the form of object.property. From 1.8.0 until 1.19.4, the
  parseSubmission future API in packages/conform-dom/formdata.ts repeatedly
  scans FormData or U…
severity: high
cvss: 8.7
cvssVector: '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'
cwe:
  - CWE-407
vendor: edmundhung
product: conform
affected:
  - 'conform >= 1.8.0, < 1.19.4'
patched:
  - '@conform-to/dom 1.19.4'
published: '2026-09-14'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:17:23.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49250'
references:
  - url: >-
      https://github.com/edmundhung/conform/commit/f9a1e696ef950efcada5f06ea2b202da505bf9b0
    label: security-advisories@github.com
  - url: 'https://github.com/edmundhung/conform/releases/tag/v1.19.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/edmundhung/conform/security/advisories/GHSA-525m-7f82-2mf7
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-525m-7f82-2mf7'
tags:
  - nvd
  - cve.org
  - ghsa
  - npm
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T19:01:15.379998Z'
cvssSource: cna
ecosystem: npm
ingestedAt: '2026-07-02T19:41:50.943Z'
epss: 0.00514
epssPercentile: 0.41307
---

## Overview

Conform, a type-safe form validation library, allows the parsing of nested objects in the form of object.property. From 1.8.0 until 1.19.4, the parseSubmission future API in packages/conform-dom/formdata.ts repeatedly scans FormData or URLSearchParams entries by each unique field name. An unauthenticated attacker can submit a crafted form containing many unique names, causing excessive synchronous CPU work and denial of service in an application that passes the submission to parseSubmission. Applications should continue to enforce request parsing limits before invoking Conform. This issue is fixed in version 1.19.4.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-49250)

Affected packages:

- `@conform-to/dom >= 1.8.0, < 1.19.4`

Patched in:

- `@conform-to/dom 1.19.4`

Source: https://github.com/advisories/GHSA-525m-7f82-2mf7