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CVE-2026-49250
Published:July 02, 2026
Updated:July 05, 2026
A CPU exhaustion vulnerability exists in Conform's ""parseSubmission"" (https://conform.guide/api/react/future/parseSubmission) future API when parsing "FormData" or "URLSearchParams" submissions with many unique field names. The parser previously looked up values by field name, which could require repeated scans of the submitted entries and cause excessive synchronous CPU work if an attacker supplies a crafted submission. «[!NOTE] The patched version fixes this by iterating submitted entries directly instead of repeatedly looking up values by field name. Applications that accept untrusted form submissions should still enforce request parsing limits before passing data to Conform. For multipart requests, "@remix-run/form-data-parser" (https://www.npmjs.com/package/@remix-run/form-data-parser) provides "maxParts", "maxTotalSize", "maxFileSize", "maxFiles", and "maxHeaderSize" options.»
Affected Packages
https://github.com/edmundhung/conform.git (GITHUB):
Affected version(s) >=v1.8.0 <v1.19.4
Fix Suggestion:
Update to version v1.19.4
@conform-to/dom (NPM):
Affected version(s) >=1.8.0 <1.19.4
Fix Suggestion:
Update to version 1.19.4
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity