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CVE-2026-49456 is an open redirect vulnerability in the npm package Waku affecting the unstable_redirect helper. Based on the provided advisory, the vulnerable behavior is that unvalidated, user-controlled input can be reflected directly into the HTTP Location header. This allows attacker-supplied redirect targets to be returned to the client without sufficient validation or restriction to local application paths. The advisory also notes a defense-in-depth concern regarding control-character and CRLF handling across non-Node runtimes, which suggests redirect input should also be sanitized to prevent malformed header behavior in alternate runtime environments.
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