Denial of Service (DoS)

Overview Affected versions of this package are vulnerable to Denial of Service DoS due to the lack of rate limiting in the login process. An attacker can exhaust server resources by sending a large number of parallel login requests via a single HTTP/2 packet, potentially causing the server to cra...

CVE-2026-26233

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to rate limit login requests which allows unauthenticated remote attackers to cause denial of service server crash and restart via HTTP/2 single packet attack with 100+ parallel login requests...

CVE-2026-26233 Denial of Service via HTTP/2 single packet attack on login endpoint

Mattermost versions 11.4.x = 11.4.0, 11.3.x = 11.3.1, 11.2.x = 11.2.3, 10.11.x = 10.11.11 fail to rate limit login requests which allows unauthenticated remote attackers to cause denial of service server crash and restart via HTTP/2 single packet attack with 100+ parallel login requests...

Linux Distros Unpatched Vulnerability : CVE-2026-21714

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOWUPDATE frames on stream 0 connection-level that cause the flow control window to exceed...

SUSE-SU-2026:20925-1 Security update for nghttp2

This update for nghttp2 fixes the following issue: - CVE-2026-27135: assertion failure due to missing state validation can lead to DoS bsc1259845...

Oracle Linux 8 : nginx:1.24 (ELSA-2026-5581)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-5581 advisory. - Resolves: RHEL-146517 - nginx:1.24/nginx: NGINX: Data injection via man-in-the-middle attack on TLS proxied connections CVE-2026-1642 - Resolves: RHEL-12728 -...

CVE-2026-33186

A flaw was found in gRPC-Go, the Go language implementation of gRPC. This vulnerability, an authorization bypass, is caused by improper input validation of the HTTP/2 :path pseudo-header. A remote attacker can exploit this by sending raw HTTP/2 frames with a malformed :path that omits the mandato...

CVE-2026-33186

Summary: CVE-2026-33186 affects gRPC-Go prior to 1.79.3, where Authorization bypass could occur due to improper input validation of the HTTP/2 :path header. The server accepted non-canonical paths like Service/Method (missing leading slash), causing canonical “deny” rules in path-based authorizat...

CVE-2026-33186

gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 :path pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the :path omitted the mandatory...

ROS-20260319-73-0002

A vulnerability in the HTTP/2 protocol implementation is related to the ability to generate a stream of requests within an already established network connection, without opening new network connections and without acknowledging the receipt of packets. Exploitation of the vulnerability could allo...

netty: netty-codec-http2: Netty MadeYouReset HTTP/2 DDoS Vulnerability

A flaw was found in Netty where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts...

SUSE-SU-2026:20752-1 Security update for libsoup

This update for libsoup fixes the following issues: Update to libsoup 3.6.6: - CVE-2025-12105: heap use-after-free in message queue handling during HTTP/2 read completion bsc1252555. - CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy bsc1254876. - CVE-2025-32049:...

Use After Free

Overview Affected versions of this package are vulnerable to Use After Free in the http/2 server implementation. An attacker can cause application instability or crashes by sending specially crafted HTTP/2 requests that trigger authentication failures, leading to access of freed memory. Note: Thi...

CVE-2026-4271

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the...

UBUNTU-CVE-2026-4271

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the...

CVE-2026-4271

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the...

CVE-2026-4271 Libsoup: libsoup: denial of service via use-after-free in http/2 server

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the...

CVE-2026-4271

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the...

openSUSE 16 Security Update : tomcat (openSUSE-SU-2026:20350-1)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20350-1 advisory. Update to Tomcat 9.0.115: - CVE-2025-66614: client certificate verification bypass due to virtual host mapping bsc1258371. - CVE-2026-24733:...

SUSE SLED15 / SLES15 Security Update : dnsdist (SUSE-SU-2026:0888-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0888-1 advisory. Update to dnsdist 1.9.11: - CVE-2025-8671: Add mitigations for the HTTP/2 MadeYouReset attack bsc1253852. -...