SB2026070951 - Improper handling of exceptional conditions in Valibot

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Main Vulnerability Database SB2026070951

SB2026070951 - Improper handling of exceptional conditions in Valibot

Published: July 9, 2026

Security Bulletin ID SB2026070951
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper handling of exceptional conditions (CVE-ID: CVE-2026-59952)

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of exceptional conditions in the flatten() helper when processing validation issues containing attacker-controlled object keys that collide with inherited Object.prototype property names. A remote attacker can supply a crafted JSON object that causes record() validation to produce an issue path such as toString and trigger a TypeError in flatten() to cause a denial of service.

This issue is reachable through normal record() validation and affects applications that flatten validation errors for API responses.


Remediation

Install update from vendor's website.

References