TI-2026-36447 Aliases CVE-2026-49250 GHSA-525m-7f82-2mf7

Conform: parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields

MEDIUM 44CWE-407Published 2026-09-14 · Updated 2026-09-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-407.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00514 44th percentileScored 2026-11-07

Fix Fixed conform (edmundhung): 1.19.4@conform-to/dom (npm): 1.19.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
edmundhung	conform	1.8.0 to before 1.19.4	1.19.4	Patch available	CNA
—	@conform-to/dom (npm)	1.8.0 to before 1.19.4	1.19.4	Patch available	GHSA-525m-7f82-2mf7

conform Vendoredmundhung Affected 1.8.0 to before 1.19.4 Fixed in 1.19.4 Patch available CNA
@conform-to/dom (npm) Vendor— Affected 1.8.0 to before 1.19.4 Fixed in 1.19.4 Patch available GHSA-525m-7f82-2mf7

Remediation

Fix · CNA conform (edmundhung) Fixed in 1.19.4
Fix · GHSA-525m-7f82-2mf7 @conform-to/dom (npm) Fixed in 1.19.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-49250
2026-10-03 Alias added: GHSA-525m-7f82-2mf7

References

Other 4

TI-2024-21738 Conform contains Prototype Pollution Vulnerability in `parseWith...` function CVSS 3.1HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences