HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/1.1 parsing process. An attacker can bypass front-end controls, capture another user's headers, or poison a cache by sending requests with differing duplicate Content-Length headers, especially when th...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/1.1 parsing process. An attacker can bypass front-end controls, capture another user's headers, or poison a cache by sending requests with differing duplicate Content-Length headers, especially when th...

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...

Reliance on Cookies without Validation and Integrity Checking

Overview Affected versions of this package are vulnerable to Reliance on Cookies without Validation and Integrity Checking via the CookieJar process. An attacker can access sensitive session or authentication cookies by influencing outbound requests to attacker-controlled hostnames, leading to...

Reliance on Cookies without Validation and Integrity Checking

Overview Affected versions of this package are vulnerable to Reliance on Cookies without Validation and Integrity Checking via the CookieJar process. An attacker can access sensitive session or authentication cookies by influencing outbound requests to attacker-controlled hostnames, leading to...

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 ...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the H2Connection process. An attacker can exhaust heap memory and cause service disruption by sending HTTP/2 HEADERS or PUSHPROMISE frames without ENDHEADERS, followed by unbounded...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the H2Connection process. An attacker can exhaust heap memory and cause service disruption by sending HTTP/2 HEADERS or PUSHPROMISE frames without ENDHEADERS, followed by unbounded...

Replay Attack

Overview org.http4s:http4s-server2.12 is a base library for building http4s servers. Affected versions of this package are vulnerable to Replay Attack through improper handling of the DigestAuth process. An attacker can execute authenticated requests as another user by replaying a previously...

Replay Attack

Overview Affected versions of this package are vulnerable to Replay Attack through improper handling of the DigestAuth process. An attacker can execute authenticated requests as another user by replaying a previously captured Authorization header. Workaround Users that are not able to upgrade to...

Replay Attack

Overview Affected versions of this package are vulnerable to Replay Attack through improper handling of the DigestAuth process. An attacker can execute authenticated requests as another user by replaying a previously captured Authorization header. Workaround Users that are not able to upgrade to...

Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure via the FollowRedirect process. An attacker can intercept sensitive credentials by inducing a redirect from HTTPS to HTTP on the same authority and observing the network traffic. Remediation Upgrade...

Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure via the FollowRedirect process. An attacker can intercept sensitive credentials by inducing a redirect from HTTPS to HTTP on the same authority and observing the network traffic. Remediation Upgrade...

Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure via the FollowRedirect process. An attacker can intercept sensitive credentials by inducing a redirect from HTTPS to HTTP on the same authority and observing the network traffic. Remediation Upgrade...

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-2026-69217

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/1.1 parser accepts differing duplicate Content-Length headers and uses the last value instead of rejecting the message. When an Ember server is behind a keep-alive intermediary that selects a different...

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...