Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-49250— Conform: parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields

Quick assessment

Affected
edmundhung conform
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Conform 是一个类型安全的表单验证库，支持以 的形式解析嵌套对象。从 1.8.0 到 1.19.4 版本， 中的 异步 API 会对每个唯一字段名反复扫描 FormData 或 URLSearchParams 条目。未经身份验证的攻击者可以提交一个包含大量唯一字段名的恶意构造表单，从而导致过多的同步 CPU 负载，造成拒绝服务（DoS），特别是在应用将表单提交传递给 的场景下。应用程序应在调用 Conform 之前继续实施请求解析限制。该问题已在 1.19.4 版本中修复。

CVSS 8.7 · High EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1020 · Automated Exfiltration

Affected Version Matrix 1

VendorProduct Version RangeStatus
edmundhung conform >= 1.8.0, < 1.19.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-49250

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Conform: parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
edmundhung conform >= 1.8.0, < 1.19.4 -

II. Public POCs for CVE-2026-49250

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-49250

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-49250 (1)

Proof of Concept for CVE-2026-49250 (1)

Vendor Pages for CVE-2026-49250 (1)

IV. Related Vulnerabilities

Same product: conform
Same vendor: edmundhung
Same weakness: CWE-407

V. Comments for CVE-2026-49250

No comments yet

Leave a comment