Microsoft Security Advisory CVE-2026-70188 - ASP.NET Core Security Feature Bypass Vulnerability

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Server.Kestrel.Core. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Kestrel accepts newli...

GHSA-FPQ8-4VHR-RCXX Microsoft Security Advisory CVE-2026-70188 - ASP.NET Core Security Feature Bypass Vulnerability

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Server.Kestrel.Core. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Kestrel accepts newli...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.linux-x64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request processi...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.linux-musl-x64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.win-arm64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request processi...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.win-x86 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request processing...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.linux-arm64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.linux-musl-arm is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request processing when newline characters in request trailers and values from the dynamic HPACK table are accepted instead of being treated as malformed. An attacker can bypass security controls and...

HTTP Request Smuggling

Overview Microsoft.AspNetCore.App.Runtime.win-x64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP/2 request processing...

CVE-2026-77762 Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request

Concurrent Execution using Shared Resource with Improper Synchronization 'Race Condition' vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from...

CVE-2026-88004

A flaw was found in Traefik, an open-source HTTP reverse proxy and load balancer. Its entrypoint defenses, designed to sanitize header names, failed to inspect request trailers. This allowed an unauthenticated client to submit malicious header names within HTTP/1.1 chunked or HTTP/2 trailers...

GO-2026-6467 Traefik entrypoint header-name sanitization bypassed via request trailers in github.com/traefik/traefik

Traefik entrypoint header-name sanitization bypassed via request trailers in github.com/traefik/traefik...

Traefik entrypoint header-name sanitization bypassed via request trailers

Summary Traefik's entrypoint defenses against spoofed trusted header names — aliasHeadersStrategy / underscoreHeadersStrategy in delete or reject mode, and the default forwardedHeaders stripping of client-supplied X-Forwarded- — scan req.Header only and never req.Trailer. An unauthenticated clien...

GHSA-V67P-PHPQ-FC8X Traefik entrypoint header-name sanitization bypassed via request trailers

Summary Traefik's entrypoint defenses against spoofed trusted header names — aliasHeadersStrategy / underscoreHeadersStrategy in delete or reject mode, and the default forwardedHeaders stripping of client-supplied X-Forwarded- — scan req.Header only and never req.Trailer. An unauthenticated clien...

CVE-2026-88004 Traefik entrypoint header-name sanitization bypassed via request trailers

Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted...

CVE-2026-88004 Traefik entrypoint header-name sanitization bypassed via request trailers

Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted...

CVE-2026-88004

Traefik (open source HTTP reverse proxy and load balancer) versions 3.2.0 through 3.7.12 have a header sanitization bypass. The entrypoint defenses aliasHeadersStrategy , underscoreHeadersStrategy , and forwardedHeaders inspect only req.Header but not req.Trailer. An unauthenticated client can pl...

jetty: Eclipse Jetty: Information disclosure due to retained HTTP/1.1 trailers across connections

A flaw was found in Eclipse Jetty. This vulnerability allows a remote attacker to cause the server to retain HTTP/1.1 request trailers from a prior connection. Consequently, subsequent requests made over the same connection may unintentionally disclose information by reporting the previously...

jetty: Eclipse Jetty: Information disclosure due to retained HTTP/1.1 trailers across connections

A flaw was found in Eclipse Jetty. This vulnerability allows a remote attacker to cause the server to retain HTTP/1.1 request trailers from a prior connection. Consequently, subsequent requests made over the same connection may unintentionally disclose information by reporting the previously...