CVE-2026-71554

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request...

HTTP Request Smuggling

Overview h2 is a Pure-Python HTTP/2 protocol implementation Affected versions of this package are vulnerable to HTTP Request Smuggling via the processing of HTTP/2 request headers containing multiple Host headers. An attacker can interfere with downstream HTTP/1.1 applications by crafting request...

DoS (Denial of Service) io.netty:netty-codec-http2 Dependency in Jira Service Management Data Center

This High severity DoS Denial of Service vulnerability was introduced in versions 10.0.0, 10.1.1, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Service Management Data Center. This DoS Denial of Service vulnerability, with a CVSS Score of 7.5 and a CVS...

DoS (Denial of Service) io.netty:netty-codec-http2 Dependency in Jira Software Data Center

This High severity DoS Denial of Service vulnerability was introduced in versions 9.12.1, 10.0.0, 10.1.1, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Software Data Center. This DoS Denial of Service vulnerability, with a CVSS Score of 7.5 and a CVSS...

EUVD-2026-53869

Hubzilla 11.2.1 contains a cross-site request forgery vulnerability in the OAuth2 /authorize endpoint handled by Zotlabs\Module\Authorize::post that allows unauthenticated attackers to register arbitrary OAuth2 applications under an authenticated user's account by submitting a cross-origin POST...

PT-2026-68931

Summary There is a critical vulnerability in Traefik's default HTTP reverse proxy that leads to unauthenticated cross-user response poisoning. When a client opens an HTTP/2 or HTTP/3 CONNECT request, Traefik forwards it — body included — to an HTTP/1.1 upstream over a shared net/http.Transport. I...

CVE-2026-71554: Inconsistent Interpretation of HTTP Requests

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request...

CVE-2026-71324: Inconsistent Interpretation of HTTP Requests

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNE...

PT-2026-68627

Name of the Vulnerable Software and Affected Versions html sanitize ex versions 0.3.1 through 1.5.2 Description An inefficient algorithmic complexity issue exists in the traversal engine. An unauthenticated remote attacker can exhaust server CPU and memory by providing a flat run of sibling...

CVE-2026-68750: Inefficient Algorithmic Complexity

Inefficient Algorithmic Complexity vulnerability in the traversal engine in rrrene htmlsanitizeex allows an unauthenticated remote attacker to exhaust server CPU and memory via a flat run of sibling elements in sanitized HTML. The list clause of HtmlSanitizeEx.Traverser.traverse/2 recurses on the...

PT-2026-68817

Name of the Vulnerable Software and Affected Versions h2 versions prior to 4.4.1 Description The software accepts request header blocks containing multiple Host headers and forwards all of them to the consuming application. When the consumer downgrades the connection from HTTP/2 to HTTP/1.1, the...

TencentOS Server 2: tomcat (TSSA-2026:0815)

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0815 advisory. Package updates are available for TencentOS Server 2 that fix the following vulnerabilities...

TencentOS Server 2: gstreamer1-plugins-bad-free (TSSA-2026:0817)

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0817 advisory. Package updates are available for TencentOS Server 2 that fix the following vulnerabilities...

CVE-2026-19024 HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message

NULL pointer dereference in H5Pgetfillvalue in HDF5 before 2.3.0 allows attackers to cause a denial of service via a dataset whose version 1 or 2 fill value message has the "defined" flag set together with a negative size field, which is not normalized to the library's "undefined" sentinel and...

EUVD-2026-53272

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate compound request size before reading StructureSize2 When ksmbd validates a compound chained SMB2 request, ksmbdsmb2checkmessage reads pdu-StructureSize2 without first checking that the compound element is large...

mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase

A flaw was found in Apache HTTP Server. This late release of memory after effective lifetime vulnerability allows a remote, unauthenticated attacker to cause a denial of service DoS. The vulnerability can lead to resource exhaustion, making the server unavailable to legitimate users...

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...

DoS (Denial of Service) io.netty:netty-codec-http2 Dependency in Jira Service Management Data Center

This High severity DoS Denial of Service vulnerability was introduced in versions 5.17.0, 10.0.0, 10.1.1, 10.2.0, 10.3.12, 10.4.0, 10.5.0, 10.6.1, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Service Management Data Center. This DoS Denial of Service vulnerability, with a CVSS Score of 7.5...

CVE-2026-56848

A flaw in Node.js HTTP/2 handling allows nghttp2sessionmemsend to be called re-entrantly while nghttp2sessionmemrecv is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js 26.x, 24.x, and 22.x...

CVE-2026-56848

A flaw in Node.js HTTP/2 handling allows nghttp2sessionmemsend to be called re-entrantly while nghttp2sessionmemrecv is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js 26.x, 24.x, and 22.x...