CVE-2026-73548

CVE-2026-73548 affects Envoy (open source edge/service proxy) prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1 . The root cause is that Envoy forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts it. An unauthenticated HTTP/2 client can smuggle a complete HTTP/1.1 requ...

CVE-2026-73548 Envoy: Cross-user response poisoning via a generic (non-WebSocket) HTTP upgrade on Envoy's shared backend pool

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An unauthenticated HTTP/2 client can place a complete...

EulerOS Virtualization 2.12.1 : nghttp2 (EulerOS-SA-2026-3601)

According to the versions of the nghttp2 package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content- Length header and body ont...

EulerOS 2.0 SP12 : nghttp2 (EulerOS-SA-2026-3286)

According to the versions of the nghttp2 package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content- Length header and body onto reusable...

EulerOS 2.0 SP12 : nghttp2 (EulerOS-SA-2026-3361)

According to the versions of the nghttp2 package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content- Length header and body onto reusable...

Alibaba Cloud Linux 3 : 0271: nghttp2 (ALINUX3-SA-2026:0271)

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2026:0271 advisory. Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities: CVE-2026-58055: nghttp2's nghttpx proxy through...

CVE-2026-74848

Apache APISIX is vulnerable to an HTTP Request/Response Smuggling flaw in serverless-plugin routes , allowing an unauthenticated network attacker to cause other clients to receive attacker-chosen or cross-user responses. The issue affects versions 2.12.0 through 3.17.0 and is fixed in version 3.1...

CVE-2026-74848 Apache APISIX: Cross-user response poisoning in serverless plugins

Inconsistent Interpretation of HTTP Requests 'HTTP Request/Response Smuggling' vulnerability in Apache APISIX. An attacker could make other clients receive attacker-chosen or other users' responses on serverless-plugin routes. This issue affects Apache APISIX: from 2.12.0 through 3.17.0. Users ar...

Unity Linux 20.1070a Security Update: nghttp2 (UTSA-2026-102505)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-102505 advisory. nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content- Length header and body onto reusable keep-alive backend...

Oracle Linux 8 : nghttp2 (ELSA-2026-55804)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-55804 advisory. 1.33.0-6.3 - fix HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests CVE-2026-58055 Tenable has extracted the...

GO-2026-6201 Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool in github.com/traefik/traefik

Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool in github.com/traefik/traefik...

nghttp2 security update

An update is available for nghttp2. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list libnghttp2 is a library implementing the Hypertext Transfer Protocol version ...

Moderate: Red Hat Security Advisory: nghttp2 security update

An update for nghttp2 is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from th...

ALSA-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,...

Oracle Linux 9 : nghttp2 (ELSA-2026-54662)

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-54662 advisory. 1.43.0-6.2 - fix HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests CVE-2026-58055 Tenable has extracted the...

CVE-2026-71324

Traefik , an open-source HTTP reverse proxy and load balancer, is vulnerable to cross-user response poisoning in its default proxy when forwarding HTTP/2 or HTTP/3 CONNECT requests to an HTTP/1.1 upstream via a shared net/http.Transport . If the upstream returns a keep-alive non-2xx response with...

undici: Undici: Response queue poisoning on reused keep-alive sockets can lead to incorrect response delivery.

A flaw was found in undici. An attacker-controlled upstream server can exploit a vulnerability in Undici's HTTP/1.1 client, specifically related to response queue poisoning on reused keep-alive sockets. This allows the attacker to inject an unsolicited HTTP/1.1 response onto an idle socket...

undici: Undici: Response queue poisoning on reused keep-alive sockets can lead to incorrect response delivery.

A flaw was found in undici. An attacker-controlled upstream server can exploit a vulnerability in Undici's HTTP/1.1 client, specifically related to response queue poisoning on reused keep-alive sockets. This allows the attacker to inject an unsolicited HTTP/1.1 response onto an idle socket...

undici: Undici: Response queue poisoning on reused keep-alive sockets can lead to incorrect response delivery.

A flaw was found in undici. An attacker-controlled upstream server can exploit a vulnerability in Undici's HTTP/1.1 client, specifically related to response queue poisoning on reused keep-alive sockets. This allows the attacker to inject an unsolicited HTTP/1.1 response onto an idle socket...

SUSE-SU-2026:2633-1 Security update for nodejs24

This update for nodejs24 fixes the following issues Update to 24.17.0: - CVE-2026-2581: undici: Undici: Denial of Service due to uncontrolled resource consumption bsc1268480. - CVE-2026-6733: undici: Undici: Response queue poisoning on reused keep-alive sockets can lead to incorrect response...