HTTP Request Smuggling Affecting org.http4s:http4s-ember-core_3 package, versions [,0.23.35)[1.0.0-M1,1.0.0-M47)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGHTTP4S-19869276
- published16 Sept 2026
- disclosed15 Sept 2026
- creditERobertGII
Introduced: 15 Sep 2026
NewCVE-2026-69204 (opens in a new tab)How to fix?
Upgrade org.http4s:http4s-ember-core_3 to version 0.23.35, 1.0.0-M47 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP message parsing process. An attacker can bypass intermediary access controls, poison caches, or cause victim requests to be joined with attacker-controlled prefixes by sending requests containing both Transfer-Encoding and Content-Length headers. This can also lead to desynchronization of client connections when a malicious or compromised upstream sends both headers.