CVE-2026-67430: Missing Release of Memory after Effective Lifetime

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not expire sessions by default, so repeated initialize requests retain unbounded ServerSession objects and can exhaust proces...

CVE-2026-67431: Improper Access Control

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not bind a session ID to a session owner, allowing an attacker with a stolen session ID to send tools/call requests that...

PT-2026-65899

Name of the Vulnerable Software and Affected Versions mcp versions prior to 0.23.0 Description The MCP::Server::Transports::StreamableHTTPTransport component in the mcp gem reads and parses an entire JSON-RPC POST body without enforcing a size limit. This allows an unauthenticated remote attacker...

PT-2026-65897

Name of the Vulnerable Software and Affected Versions mcp versions prior to 0.23.0 Description The MCP::Server::Transports::StreamableHTTPTransport component in the mcp gem does not expire sessions by default. Consequently, repeated initialize requests lead to the retention of unbounded...

RockyLinux 9 : ruby (RLSA-2026:33512)

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:33512 advisory. ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments CVE-2026-42258 net-imap: ruby: Net::IMAP: Information disclosure via...

Linux Distros Unpatched Vulnerability : CVE-2026-54620

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - sqlite3 provides Ruby bindings for the SQLite3 embedded database. From 2.1.0 to 2.9.4, the callbacks used for SQLite aggregate functions can be freed while stil...

CVE-2026-63118: Origin Validation Error

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not validate the HTTP Host or Origin request headers, which allows a malicious browser page to use DNS rebinding to reach a...

PT-2026-65888

Name of the Vulnerable Software and Affected Versions mcp versions prior to 0.23.0 Description The MCP::Server::Transports::StreamableHTTPTransport component in the mcp gem fails to validate the HTTP Host or Origin request headers. This allows a malicious browser page to utilize DNS rebinding—a...

CVE-2026-63119: Uncontrolled Resource Consumption

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StdioTransport and MCP::Client::Stdio in the mcp gem use IOgets without a byte limit, allowing a peer that sends data without a newline to exhaust process memory. This...

Linux Distros Unpatched Vulnerability : CVE-2026-54619

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - sqlite3 provides Ruby bindings for the SQLite3 embedded database. In version 2.9.4 and earlier, redefining a SQLite function with a different arity frees the...

Linux Distros Unpatched Vulnerability : CVE-2026-54603

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect OIDC. From 0.4.0 to 2.0.21, a protocol-relative redirect...

CVE-2026-54659

Pagy is agnostic pagination in plain Ruby. From 43.0.0 until 43.5.6, Pagy::I18n.locale= in gem/lib/pagy/modules/i18n/i18n.rb stored locale values verbatim and later used them as .yml path components, allowing untrusted params:locale values with absolute paths or ../ sequences to create a file...

CVE-2026-54603

creationtimestamp| type| source ---|---|--- 2026-07-28 18:35:08+00:00| published-proof-of-concept| https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9 2026-07-28 20:31:48+00:00| seen| https://gist.github.com/alon710/76a4f64bf3e94be3974678cdc55c68d9...

DEBIAN-CVE-2026-54619

sqlite3 provides Ruby bindings for the SQLite3 embedded database. In version 2.9.4 and earlier, redefining a SQLite function with a different arity frees the previously registered function handler while SQLite may still reference it, resulting in a use-after-free. This issue is fixed in version...

DEBIAN-CVE-2026-54620

sqlite3 provides Ruby bindings for the SQLite3 embedded database. From 2.1.0 to 2.9.4, the callbacks used for SQLite aggregate functions can be freed while still referenced during aggregation, resulting in a use-after-free. This issue is fixed in version 2.9.5...

CVE-2026-54603

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect OIDC. From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Clientrequest overrides the request authority, so the bearer Authorization header is sent to an...

CVE-2026-54605

OAuth is a Ruby wrapper for the OAuth 1.0 and 1.0a protocols, providing clients and servers. From 0.5.5 to 1.1.5, OAuth::Consumertokenrequest parses the raw Location header of a 300 to 399 redirect returned by the OAuth server and follows the redirect recursively, which can mutate the consumer's...

CVE-2026-54619

sqlite3 provides Ruby bindings for the SQLite3 embedded database. In version 2.9.4 and earlier, redefining a SQLite function with a different arity frees the previously registered function handler while SQLite may still reference it, resulting in a use-after-free. This issue is fixed in version...

CVE-2026-54620

sqlite3 provides Ruby bindings for the SQLite3 embedded database. From 2.1.0 to 2.9.4, the callbacks used for SQLite aggregate functions can be freed while still referenced during aggregation, resulting in a use-after-free. This issue is fixed in version 2.9.5...

CVE-2026-54619

sqlite3 provides Ruby bindings for the SQLite3 embedded database. In version 2.9.4 and earlier, redefining a SQLite function with a different arity frees the previously registered function handler while SQLite may still reference it, resulting in a use-after-free. This issue is fixed in version...