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Http4s-Ember-Core (<= 0.23.34)

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critical advisory

HTTP Request Smuggling Vulnerability in http4s Ember

The http4s Ember HTTP/1.1 parser fails to reject messages containing both 'Transfer-Encoding' and 'Content-Length' headers, enabling CL.TE request smuggling attacks.

http4s-ember-core +5 request-smuggling cve-2026-69204 http-vulnerability denial-of-service vulnerability http2 http4s cve-2026-69202
3t 1c