CVE-2026-31951

Vulnerability summary : LibreChat’s MCP server feature (versions 0.8.2-rc1 to 0.8.3-rc1) allows arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can host a malicious MCP server with headers like {{LIBRECHAT_OPENID_ACCESS_TOKEN}} to exfiltrate victims’ OAuth tok...

CVE-2026-31951 LibreChat's MCP Server Header Injection Enables OAuth Token Theft

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP Model Context Protocol servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containin...

CVE-2026-31951

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP Model Context Protocol servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containin...

CVE-2026-31951 LibreChat's MCP Server Header Injection Enables OAuth Token Theft

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP Model Context Protocol servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containin...

GO-2026-4762 Authorization bypass in gRPC-Go via missing leading slash in :path in google.golang.org/grpc

Authorization bypass in gRPC-Go via missing leading slash in :path in google.golang.org/grpc...

HTTP Request Smuggling

Overview io.undertow:undertow-core is a Java web server based on non-blocking IO. Affected versions of this package are vulnerable to HTTP Request Smuggling via discrepancies in the parsing of HTTP header names. An attacker can bypass security controls and access unauthorized resources by sending...

GHSA-8V4X-MGVP-P658 Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks,...

Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending \r\r\r as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer,...

EUVD-2026-16696

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks,...

Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks,...

HTTP Request Smuggling

Overview io.undertow:undertow-core is a Java web server based on non-blocking IO. Affected versions of this package are vulnerable to HTTP Request Smuggling due to incorrect handling of white-spaces in HTTP request headers. An attacker can gain unauthorized access to restricted information or...

EUVD-2026-16698

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform...

HTTP Request Smuggling

Overview io.undertow:undertow-core is a Java web server based on non-blocking IO. Affected versions of this package are vulnerable to HTTP Request Smuggling via the proxy server. An attacker can gain unauthorized access or manipulate web requests by sending specially crafted header block...

EUVD-2026-16694

A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending \r\r\r as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer,...

GHSA-VQQJ-9CMV-HX43 Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform...

GHSA-3GV6-G396-9V4R Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending \r\r\r as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer,...

Undertow is Vulnerable to HTTP Request/Response Smuggling

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform...

Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass

Summary There is a potential vulnerability in Traefik's Kubernetes Knative, Ingress, and Ingress-NGINX providers related to rule injection. User-controlled values are interpolated into backtick-delimited Traefik router rule expressions without escaping or validation. A malicious value containing ...

BIT-NATS-2026-33246 NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a Nats-Request-Info: message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NAT...

BIT-NATS-2026-33223 NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header Nats-Request-Info: is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was...