HTTP Request Smuggling Affecting org.springframework:spring-webflux package, versions [,6.2.18)[7.0.0-M1, 7.0.7)
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-ORGSPRINGFRAMEWORK-16109604
- published21 Apr 2026
- disclosed17 Apr 2026
- creditYuki Matsuhashi
Introduced: 17 Apr 2026
CVE-2026-22741 (opens in a new tab)How to fix?
Upgrade org.springframework:spring-webflux to version 6.2.18, 7.0.7 or higher.
Overview
org.springframework:spring-webflux is a Spring Framework module that contains support for reactive HTTP and WebSocket clients as well as for reactive server web applications including REST, HTML browser, and WebSocket style interactions.
Affected versions of this package are vulnerable to HTTP Request Smuggling via the static resource resolution and caching mechanism. An attacker can poison the resource cache by sending crafted requests that cause resources to be cached with incorrect encodings when resource chain caching and encoded resource resolution are enabled. This can lead to denial of service by breaking front-end resource loading for subsequent clients.
Note: This is only exploitable if all the following is true:
The application is configuring the resource chain support with caching enabled.
The application adds support for encoded resource resolution.
The resource cache must be empty when the attacker has access to the application.