CVE-2026-49250
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
In Conform 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.
Risk Assessment
Can cause denial of service in an application that passes the submission to parseSubmission. Applications should continue to enforce request parsing limits before invoking Conform.
Recommendation
Update Conform to version 1.19.4 (or later). Enforce request parsing limits before invoking parseSubmission.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

