CVE-2026-66046

Expat through 2.8.3 has quadratic complexity in storeAtts() in xmlparse.c when processing N attributes with non-normalized values, enabling remote unauthenticated DoS via a small XML document. CVSS 7.5 HIGH. No exploitation observed. Fix: upgrade to patched version (PR #1321).

CLSA-2026-1787055425 TuxCare security update for 112 packages (2 CVEs)

TuxCare rebuilt 112 packages to address 2 CVEs. Fixed in 7.16.7-tuxcare.2...

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...

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...

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...

Red Hat Security Advisory 2026-55804-03

Red Hat Security Advisory 2026-55804-03 - An update for nghttp2 is now available for Red Hat Enterprise Linux 8...

PT-2026-78179

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 hang or a frequently...

PT-2026-78185

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 unauthorized read access to a...

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...

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...

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...

Oracle Linux 8 : haproxy (ELSA-2026-55859)

The remote Oracle Linux 8 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-55859 advisory. 1.8.27-5.2 - Fix NULL pointer dereference in hpackdhtinsert CVE-2026-55204, RHEL-211083 Tenable has extracted the preceding description block directly from the...

PT-2026-78223

Name of the Vulnerable Software and Affected Versions Oracle Fusion Middleware Helidon version 4.5.1 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 hang or a frequently...

PT-2026-78176

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 unauthorized access to critic...

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...

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...

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-2026-73935: Improper Access Control

Vulnerability in the Helidon product of Oracle Fusion Middleware component: Imperative Web Server. Supported versions that are affected are 4.0.0-4.5.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of thi...