CVE-2026-9739

CVE-2026-9739 describes a DNS rebinding vulnerability due to a hardcoded Access-Control-Allow-Origin: * in the SSE initialization handler, despite earlier attempts to align with MCP security guidelines using allowed-origins and allowed-hosts. The issue specifically affects users connecting via To...

EUVD-2026-32003

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

CVE-2026-44895

CVE-2026-44895 (GitLab MCP Server SSE transport) has concrete technical details in the connected documents. The MCP server’s SSE HTTP transport (USE_SSE=true) ships with no authentication and sets Access-Control-Allow-Origin: * on all responses, exposing a stateful RPC endpoint backed by the oper...

CVE-2026-44895 GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

CVE-2026-44895 GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

EUVD-2026-31869

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort"", ":5553" resolves to ":5553"...

CVE-2026-46430

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort"", ":5553" resolves to ":5553"...

CVE-2026-46430 Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort"", ":5553" resolves to ":5553"...

PT-2026-42629

Unauthenticated Cross-Origin MCP Tool Invocation via Empty Default Secret | Field | Value | | ---------------- | ----- | | Repository | Jovancoding/Network-AI | | Affected version | v5.4.4 commit c12686e181f231cf8d7bcf836a96d78f0f0877ac | Summary The MCP SSE server defaults to an empty secret...

GHSA-GJ84-924C-48FX Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS

Summary The SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort"", ":5553" resolves to ":5553" — a Go http.Server.Addr of ":5553" listens on every interface. On...

Astra Linux - уязвимость в libde265

It was discovered that Libde265 v1.0.8 contains a heap-buffer-overflow vulnerability through the ffhevcputhevcepelpixels8sse function in sse-motion.cc. This vulnerability allows attackers to cause a Denial of Service DoS attack using a crafted video file...

PT-2026-42208

Summary The SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a...

CR Injection in SSE Encoder Enables Event Splitting via cow_sse:event/1

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CVE-2026-44217

sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject arbitrary messages into t...

CVE-2026-44217 sse-channel: SSE Injection via unsanitized event fields

sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject arbitrary messages into t...

CVE-2026-44217

The CVE-2026-44217 entry affects the sse-channel SSE implementation used in Node.js streams. Prior to version 4.0.1, passing user-provided values to the event, retry, or id fields allows event spoofing, enabling injection of arbitrary SSE messages into the stream and potentially impacting consume...

sse-channel 注入漏洞

SSE-Channel is a server-push event channel tool developed by Espen Hovlandsdal, based on Node.js. Versions of SSE-Channel prior to 4.0.1 had an injection vulnerability. This vulnerability stemmed from implementations that allowed users to provide values passed into fields such as event, retry, or...

CVE-2026-43968 CR Injection in SSE Encoder Enables Event Splitting via cow_sse:event/1

Improper Neutralization of CRLF Sequences 'CRLF Injection' vulnerability in ninenines cowlib allows SSE event splitting and injection via unvalidated field values. cowsse:event/1 in cowlib guards the id and event fields against \n but not against bare \r, and the internal prefixlines/2 function...

CVE-2026-43968

Improper Neutralization of CRLF Sequences 'CRLF Injection' vulnerability in ninenines cowlib allows SSE event splitting and injection via unvalidated field values. cowsse:event/1 in cowlib guards the id and event fields against \n but not against bare \r, and the internal prefixlines/2 function...

Cowlib 注入漏洞

Cowlib is a web protocol message parsing and building library developed by Nine Nines. Version 2.6.0 of cowlib contains an injection vulnerability. This vulnerability arises from the program’s failure to properly filter CRLF sequences when processing events sent by the server, resulting in SSE...