GHSA-F49M-VF83-692W i18next-http-middleware: MissingKeyHandler does not reject keys whose segments contain prototype-polluting names

Impact i18next-http-middleware ≤ 3.9.6's missingKeyHandler blocked the literal request-body keys proto, constructor, and prototype added in 3.9.3, see GHSA-5fgg-jcpf-8jjw, but did not reject dotted variants such as "proto.polluted". Downstream backends that split the missing-key string on a...

CVE-2026-48714

The CVE-2026-48714 issue affects i18next-http-middleware prior to 3.9.7. The missingKeyHandler can accept request-body keys like proto , constructor, and prototype (and similar dotted variants) and, when downstream backends such as i18next-fs-backend ≤ 2.6.5 split on keySeparator, passes them to ...

CVE-2026-48714 i18next-http-middleware missingKeyHandler does not reject keys whose segments contain prototype-polluting names

i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. In versions prior to 3.9.7, the missingKeyHandler blocked the literal request-body keys proto, constructor, and prototype added in 3.9.3, see GHSA-5fgg-jcpf-8jjw, but did not...