CVE-2026-69216
Description
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data without re-encoding and interprets malformed chunk boundaries differently, an unauthenticated attacker can create TE.TE request smuggling that bypasses intermediary controls, poisons caches, or hijacks the request queue. The same response-path leniency can enable response smuggling against an ember-client used as a gateway when the upstream is malicious or compromised. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
How to fix
- org.http4s:http4s-ember-core_2.120.23.35 or later
- org.http4s:http4s-ember-core_2.130.23.35, 1.0.0-M47 or later
- org.http4s:http4s-ember-core_30.23.35, 1.0.0-M47 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.http4s:http4s-ember-core_2.12Maven | v < 0.23.35 | 0.23.35 |
| org.http4s:http4s-ember-core_2.13Maven | v < 0.23.35, 1.0.0-M1 ≤ v < 1.0.0-M47 | 0.23.35, 1.0.0-M47 |
| org.http4s:http4s-ember-core_3Maven | v < 0.23.35, 1.0.0-M1 ≤ v < 1.0.0-M47 | 0.23.35, 1.0.0-M47 |
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