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Fencer Vulns
high 8.6

CVE-2024-32866 json

Conform contains Prototype Pollution Vulnerability in `parseWith...` function

published 2024-04-23 2 y ago modified 2026-09-10 1 mo ago also GHSA-624g-8qjg-8qxf , EUVD-2024-1112

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

Conform, a type-safe form validation library, allows the parsing of nested objects in the form of `object.property`. Due to an improper implementation of this feature in versions prior to 1.1.1, an attacker can exploit the feature to trigger prototype pollution by passing a crafted input to `parseWith...` functions. Applications that use conform for server-side validation of form data or URL parameters are affected by this vulnerability. Version 1.1.1 contains a patch for the issue.

Patch / fix

  • npm @conform-to/dom 0.9.2, 1.1.1
  • npm @conform-to/zod 0.9.2, 1.1.1
  • npm @conform-to/yup 0.9.2, 1.1.1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
GitHub 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected packages

ecosystem package affected fixed in
npm @conform-to/dom
>=1.0.0, <1.1.1
<0.9.2
1.1.1
0.9.2
npm @conform-to/zod
>=1.0.0, <1.1.1
<0.9.2
1.1.1
0.9.2
npm @conform-to/yup
>=1.0.0, <1.1.1
<0.9.2
1.1.1
0.9.2

Affected products

  • edmundhung conform

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.