SB20261110293 - Prototype pollution in i18next-fs-backend

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Main Vulnerability Database SB20261110293

SB20261110293 - Prototype pollution in i18next-fs-backend

Published: November 10, 2026

Security Bulletin ID SB20261110293
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) Prototype pollution (CVE-ID: N/A)

CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')

CVSSv4: 8.7 [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]


The vulnerability allows a remote attacker to cause a denial of service lasting for the lifetime of the application process.

The vulnerability exists due to prototype pollution through inherited-property traversal in i18next-fs-backend's getLastOfPath function when processing missing-key writes or queued language/namespace paths. A remote attacker can submit {"hasOwnProperty.call":"PWNED"} to a missing-key write route with saveMissing enabled to overwrite Object.prototype.hasOwnProperty.call and cause subsequent requests to fail.


Remediation

Install update from vendor's website.

References