CVE-2026-47857

Reactor Core is affected by a Denial of Service condition in the Flux.windowTimeout operator when fairBackpressure is enabled. The root cause is a 20-bit index wrap-around that can cause the stream to hang, leading to an availability impact with no confidentiality or integrity loss. Affected vers...

CVE-2026-47857 Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around

In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service DoS condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.5.0 - 3.7.19 Reactor Core 3.4.41 and earlier...

CVE-2026-47845

Reactor Netty HTTP Server may incorrectly evaluate the remote IP address in specific scenarios when the HAProxy Protocol is enabled, allowing a client to spoof the reported source address. Affected versions are 1.3.0–1.3.6 , 1.1.0–1.2.18 , and 1.0.52 and earlier . The vulnerability is rated CVSS ...

CVE-2026-47845 Reactor Netty HTTP Server may incorrectly evaluate proxy addresses

In specific scenarios, Reactor Netty HTTP Server may incorrectly evaluate the remote IP address when HAProxy Protocol is enabled. In order for this to happen, the application must be configured to use HAProxy Protocol. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52...

CVE-2026-47848

In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 -...

CVE-2026-47844

In specific scenarios, the Reactor Netty HTTP Server may leak exception details across unrelated requests. In order for this to happen, the server must be configured with Brave Tracing. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

CVE-2026-47843

In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

EUVD-2026-66680

In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 -...

CVE-2026-47848 Reactor Netty WebSocket Client Leaks Credentials On Redirect

In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 -...

CVE-2026-47848

CVE-2026-47848 affects the Reactor Netty WebSocket client (versions 1.0.52 and earlier , 1.1.0–1.2.18 , and 1.3.0–1.3.6 ). In specific scenarios where a WebSocket handshake is redirected to a different origin , the client may leak credentials to the redirected origin. The condition requires the H...

EUVD-2026-66679

In specific scenarios, the Reactor Netty HTTP Server may leak exception details across unrelated requests. In order for this to happen, the server must be configured with Brave Tracing. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

CVE-2026-47844 Reactor Netty HTTP Server Leaks Exception Details

In specific scenarios, the Reactor Netty HTTP Server may leak exception details across unrelated requests. In order for this to happen, the server must be configured with Brave Tracing. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

CVE-2026-47844

Reactor Netty HTTP Server may leak exception details across unrelated requests when the server is configured with Brave Tracing . Affected versions are 1.3.0–1.3.6 , 1.1.0–1.2.18 , and 1.0.52 and earlier . The CVSS 3.1 score is 5.3 (Medium) , with low integrity impact and no confidentiality or av...

EUVD-2026-66678

In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

CVE-2026-47843 Reactor Netty may incorrectly route traffic due to DNS resolver reuse

In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...

CVE-2026-47843

CVE-2026-47843 affects Reactor Netty (versions 1.3.0–1.3.6, 1.1.0–1.2.18, and 1.0.52 and earlier). In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver, potentially causing traffic to ...

PT-2026-82357

Name of the Vulnerable Software and Affected Versions Reactor Core versions 3.0.0 through 3.7.19 Reactor Core versions 3.8.0 through 3.8.6 Description Applications using the Flux.bufferTimeout operator with fairBackpressure enabled are susceptible to a Denial of Service DoS condition. Fair...

PT-2026-82347

In specific scenarios, Reactor Netty HTTP Server may incorrectly evaluate the remote IP address when HAProxy Protocol is enabled. In order for this to happen, the application must be configured to use HAProxy Protocol. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52...

PT-2026-82352

In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service DoS condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.5.0 - 3.7.19 Reactor Core 3.4.41 and earlier...

PT-2026-82358

The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier...