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CVE-2026-48714 is a remote prototype pollution vulnerability in i18next-http-middleware affecting versions prior to 3.9.7. The flaw is in missingKeyHandler: while earlier hardening blocked literal request-body keys such as proto, constructor, and prototype, it failed to reject dotted variants like "proto.polluted". When such attacker-controlled missing-key strings are forwarded to downstream backends that split keys on the configured keySeparator, notably i18next-fs-backend <= 2.6.5, they can reach an unguarded setPath()-style walker and cause writes to Object.prototype. This creates a remotely reachable prototype pollution condition in applications that expose missingKeyHandler to untrusted input.
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A companion middleware vulnerability that expands the attack surface and helps remote input reach the vulnerable code path associated with the i18next-fs-backend prototype pollution issue.
A critical remote prototype pollution vulnerability in i18next-http-middleware's missingKeyHandler that can allow untrusted input to write to Object.prototype via dotted keys, especially when used with i18next-fs-backend 2.6.5 or earlier.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.