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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-525m-7f82-2mf7 @conform-to/dom parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields
Fixes

Solution

No solution given by the vendor.


Workaround

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History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Conform: parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields
Weaknesses CWE-407
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-14T19:01:26.926Z

Reserved: 2026-05-28T14:33:01.178Z

Link: CVE-2026-49250

cve-icon Vulnrichment

Updated: 2026-09-14T19:01:21.958Z

cve-icon NVD

Status : Received

Published: 2026-09-14T18:17:49.360

Modified: 2026-09-14T19:17:23.587

Link: CVE-2026-49250

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses