Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the unbounded queue used for outbound HTTP/2 frames. An attacker can exhaust server memory by continuously sending frames that trigger the server to enqueue responses faster than they are processed. Workarou...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the unbounded queue used for outbound HTTP/2 frames. An attacker can exhaust server memory by continuously sending frames that trigger the server to enqueue responses faster than they are processed. Workarou...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the lack of enforcement of SETTINGSMAXCONCURRENTSTREAMS in HTTP/2 connections. Details Denial of Service DoS describes a family of attacks, all aimed at making a system inaccessible to its intended and...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the lack of enforcement of SETTINGSMAXCONCURRENTSTREAMS in HTTP/2 connections. Details Denial of Service DoS describes a family of attacks, all aimed at making a system inaccessible to its intended and...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the lack of enforcement of SETTINGSMAXCONCURRENTSTREAMS in HTTP/2 connections. Details Denial of Service DoS describes a family of attacks, all aimed at making a system inaccessible to its intended and...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS in the HTTP/2 flow-control process. An attacker can exhaust system memory by sending data faster than it is consumed by the application, causing unbounded buffering and potential service disruption. Details Denial ...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS in the HTTP/2 flow-control process. An attacker can exhaust system memory by sending data faster than it is consumed by the application, causing unbounded buffering and potential service disruption. Details Denial ...

Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS in the HTTP/2 flow-control process. An attacker can exhaust system memory by sending data faster than it is consumed by the application, causing unbounded buffering and potential service disruption. Details Denial ...

CVE-2026-88975

Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s 24-bit declared length but waits to buffer the entire payload before comparing it with SETTINGSMAXFRAMESIZE. An unauthenticated peer can declare a payload near 16 MiB on a...

CVE-2026-83276

Vulnerability in the Helidon product of Oracle Fusion Middleware component: helidon-webclient-http2. Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of...

CVE-2026-83280

Vulnerability in the Helidon product of Oracle Fusion Middleware component: helidon-webserver-http2. Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of...

CVE-2026-69218

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or PUSHPROMISE frame without ENDHEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete bloc...

CVE-2026-69203

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through withHttp2 does not enforce SETTINGSMAXCONCURRENTSTREAMS for peer-created streams. One unauthenticated connection can open an unbounded number of streams, each retaining...

CVE-2026-69202

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can...

EUVD-2026-79632

Vulnerability in the Helidon product of Oracle Fusion Middleware component: helidon-webserver-http2. Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of...

CVE-2026-83280

CVE-2026-83280 is a Denial of Service vulnerability in Oracle Helidon (component: helidon-webserver-http2 ), part of Oracle Fusion Middleware. Affected versions are 4.0.0 through 4.5.4 . An unauthenticated attacker with network access can send crafted requests via HTTP/2 to cause a hang or freque...

CVE-2026-83276

CVE-2026-83276 affects the helidon-webclient-http2 component of Oracle Helidon (part of Oracle Fusion Middleware), versions 4.0.0 through 4.5.4 . An unauthenticated attacker with network access via HTTP/2 can trigger a hang or frequently repeatable crash, resulting in a complete denial of service...

EUVD-2026-79628

Vulnerability in the Helidon product of Oracle Fusion Middleware component: helidon-webclient-http2. Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of...

GHSA-GQ9P-F254-H286 Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE

Summary An unauthenticated peer can make Ember's HTTP/2 read loop hold 16 MiB of a single frame in memory on a connection where Ember advertised a 16 KiB limit. The declared length is readable from the frame's first 9 bytes, but it is not compared against SETTINGSMAXFRAMESIZE until the whole...

Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE

Summary An unauthenticated peer can make Ember's HTTP/2 read loop hold 16 MiB of a single frame in memory on a connection where Ember advertised a 16 KiB limit. The declared length is readable from the frame's first 9 bytes, but it is not compared against SETTINGSMAXFRAMESIZE until the whole...