Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling)

Summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive substring test for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunked are incorrectly accepted, and Unicode case folding can turn a Kelvin-sign byte sequence into a match when UTF-8 is used. Intermediaries that apply RFC-compliant token and charset rules can therefore disagree with Ember’s Content-Length or zero-length framing, enabling TE.CL or TE.0 request smuggling, access-control bypass, cross-user request hijacking, and cache poisoning on the server path. Response smuggling through an ember-client gateway requires a malicious or compromised upstream. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Timeline

1. Sep 15, 2026, 7:15 PM UTCCVE published
2. Sep 15, 2026, 7:32 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Sep 15, 2026, 7:33 PM UTCRecord last updated

Affected versions

• http4s http4s

  fixed in 0.23.35; From 1.0.0-M1 · fixed in 1.0.0-M47

• org.http4s:http4s-ember-core_3Maven

  fixed in 0.23.35

• org.http4s:http4s-ember-core_2.13Maven

  fixed in 0.23.35

• org.http4s:http4s-ember-core_2.12Maven

  fixed in 0.23.35

• org.http4s:http4s-ember-core_2.13Maven

  From 1.0.0-M1 · fixed in 1.0.0-M47

• org.http4s:http4s-ember-core_3Maven

  From 1.0.0-M1 · fixed in 1.0.0-M47

References 4