httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack

A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are th...

tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation

A flaw was found in Apache Tomcat. This improper input validation vulnerability, stemming from an incomplete fix for CVE-2026-32990, allows for an HTTP/2 no-authority bypass of strict Server Name Indication SNI validation. This could potentially lead to unauthorized access or misrouting of reques...

tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak

A flaw was found in Apache Tomcat. This vulnerability, an uncontrolled resource consumption issue, arises from an allocation leak in the HTTP/2 backlog tracking when a stream is reset. A remote attacker could exploit this to cause a Denial of Service DoS, making the server unresponsive or...

RLSA-2026:55804 Moderate: nghttp2 security update

libnghttp2 is a library implementing the Hypertext Transfer Protocol version 2 HTTP/2 protocol in C. Security Fixes: nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests CVE-2026-58055 For more details about the security issues,...

httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack

A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are th...

PT-2026-78176

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. The supported version that is affected is 4.5.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this...

CVE-2026-73934: Improper Access Control

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. Supported versions that are affected are 3.0.0-3.2.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of th...

PT-2026-78223

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. The supported version that is affected is 4.5.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this...

CVE-2026-73896: Improper Access Control

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of thi...

Oracle Linux 9 : haproxy (ELSA-2026-55772)

The remote Oracle Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-55772 advisory. - Fix NULL pointer dereference in hpackdhtinsert CVE-2026-55204 Resolves: RHEL-211082 Tenable has extracted the preceding description block directly...

RockyLinux 8 : haproxy (RLSA-2026:55859)

The remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:55859 advisory. haproxy: HAProxy: Denial of Service via HPACK dynamic table insertions CVE-2026-55204 Tenable has extracted the preceding description block directly from the...

PT-2026-78225

Name of the Vulnerable Software and Affected Versions Oracle Fusion Middleware Helidon version 4.5.0 Description A flaw in the Imperative Web Server component allows an unauthenticated attacker with network access via HTTP/2 to compromise the system. This can lead to a complete Denial of Service...

MiracleLinux 9 : dotnet9.0-9.0.119-1.el9_8.ML.1 (AXSA:2026-1557:15)

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1557:15 advisory. dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM CVE-2026-50651 dotnet: .NET Core: Denial of Service via type...

PT-2026-78222

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. The supported version that is affected is 3.2.19. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this...

CVE-2026-73887: Improper Access Control

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of thi...

CVE-2026-73890: Improper Access Control

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of thi...

KLA91234 SB vulnerabilities in Apache Tomcat

Security bypass vulnerabilities were found in Apache Tomcat. Malicious users can exploit these vulnerabilities to bypass security restrictions. Below is a complete list of vulnerabilities: 1. Security vulnerability can be exploited to bypass security restrictions. 2. Security vulnerability in...

RHEL 9 : mod_http2 (RHSA-2026:55992)

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:55992 advisory. The modh2 Apache httpd module implements the HTTP2 protocol h2+h2c on top of libnghttp2 for httpd 2.4 servers. Security Fixes: modhttp2:...

AlmaLinux 8 : haproxy (ALSA-2026:55859)

The remote AlmaLinux 8 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:55859 advisory. haproxy: HAProxy: Denial of Service via HPACK dynamic table insertions CVE-2026-55204 Tenable has extracted the preceding description block directly from the...

RHEL 9 : mod_http2 (RHSA-2026:55930)

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:55930 advisory. The modh2 Apache httpd module implements the HTTP2 protocol h2+h2c on top of libnghttp2 for httpd 2.4 servers. Security Fixes: modhttp2:...