File read or SSRF via unsanitized identifiers
Published May 8, 2026 · Updated May 8, 2026
Path traversal and SSRF in i18next-http-middleware before 3.9.3 allow remote attackers to read files or reach internal services. The getResourcesHandler function passes unvalidated lng and ns values into backendConnector.load, where filesystem or HTTP backends interpolate them into paths or URLs. Exploitation requires the application to expose this handler with a path-interpolating backend; resulting access is limited to files readable by the process or network destinations reachable from it.
Summary
What happened
Path traversal and SSRF in i18next-http-middleware before 3.9.3 allow remote attackers to read files or reach internal services. The getResourcesHandler function passes unvalidated lng and ns values into backendConnector.load, where filesystem or HTTP backends interpolate them into paths or URLs. Exploitation requires the application to expose this handler with a path-interpolating backend; resulting access is limited to files readable by the process or network destinations reachable from it.
The record
- CVE
- CVE-2026-42353
- Published
- May 8, 2026
- Updated
- May 8, 2026
- Vendor
- i18next
- Product
- i18next-http-middleware
- Classifications
- CWE-918, CWE-22, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 8, 2026CVE publishedPublication date reported by the CVE source.
- May 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.9.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream crafted resource request exampleproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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