🛡️ CVE-2026-49250 — dom

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-407 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

@conform-to/dom parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-49250 is classified as CWE-407: Inefficient Algorithmic Complexity. Crafted input drives an algorithm into its worst case, so a small request costs disproportionate work.

Affected software

CVE-2026-49250 is recorded against 1 package.

  • @conform-to/dom

Timeline and source

Published on 2 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS 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
CWE CWE-407
Public Exploit ✅ No
Source OSV
Published 2026-07-02
Updated 2026-08-12
Modified 2026-07-02
Fix URL N/A

Affected Packages

Software From version Fixed in
@conform-to/dom — —

Similar Threats

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