Path traversal in i18next-fs-backend - CVE-2026-41693
Published: November 10, 2026
Vulnerability identifier: #VU164414
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41693
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to read or overwrite files outside the intended locale directory, subject to the Node process's filesystem privileges.
The vulnerability exists due to path traversal in i18next-fs-backend when unvalidated lng or ns values are interpolated into loadPath or addPath templates. A remote attacker can supply crafted language or namespace values, such as ?lng=../../../../etc/passwd, to read files or, when saveMissing is enabled and attacker-controlled values are forwarded, overwrite files with attacker-controlled JSON.
Affected software
i18next-fs-backend
How to mitigate CVE-2026-41693
Install security update from vendor's website.
i18next-fs-backend - update to 2.6.4