Source: node-i18next Version: 23.7.6-2 X-Debbugs-CC: [email protected] Severity: important Tags: security upstream
Hi, The following vulnerability was published for node-i18next. CVE-2026-63402[0]: | i18next is an internationalization framework for JavaScript. Prior | to version 26.3.4, `deepExtend` in `src/utils.js` checks property | existence with the in operator and recurses into inherited built-ins | reached through `Object.prototype`. An application must explicitly | pass attacker-controlled resource data to `addResourceBundle(lng, | ns, data, deep, overwrite)` with both `deep: true` and `overwrite: | true`. Source keys such as `hasOwnProperty`, `toString` and | `valueOf` can then select shared inherited built-in function | objects, and a nested value can overwrite a property of those | objects process-wide. For example, making | `Object.prototype.hasOwnProperty.call` non-callable causes | subsequent uses, including i18next internals, to throw TypeError, | resulting in unrecoverable denial of service and limited integrity | impact. The `__proto__`/`constructor` guard does not prevent this | mechanism because the corruption target is an inherited built-in | function rather than the prototype object itself. Default calls | without deep merging or with overwrite falsy are unaffected, and no | standard i18next backend or integration uses the vulnerable | configuration. This issue is distinct from the setPath/key-walking | prototype-pollution flaws in i18next-fs-backend (CVE-2026-48713) and | i18next-http-middleware (CVE-2026-48714). This issue is fixed in | version 26.3.4. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-63402 https://www.cve.org/CVERecord?id=CVE-2026-63402 [1] https://github.com/i18next/i18next/security/advisories/GHSA-6jcc-5g8w-32mx [2] https://github.com/i18next/i18next/commit/642137b7786d83661ec3ee53027798dc4b81d30a Please adjust the affected versions in the BTS as needed. Regards, Salvatore
