HTTP Request Smuggling Affecting org.http4s:http4s-ember-server_native0.4_2.12 package, versions [,0.23.31)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-13019557
- published24 Sept 2025
- disclosed23 Sept 2025
- creditsebastianosrt
Introduced: 23 Sep 2025
NewCVE-2025-59822 (opens in a new tab)How to fix?
Upgrade org.http4s:http4s-ember-server_native0.4_2.12 to version 0.23.31 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling due to improper parsing of the HTTP trailer section in the parse function. An attacker can bypass security controls, launch targeted attacks against users, or poison web caches by crafting specially formed HTTP requests that exploit the incorrect handling of trailer headers.
Note:
This is only exploitable if the application is deployed behind a reverse-proxy that forwards trailer headers.