RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful Streamable HTTP server in crates/rmcp/src/transport/streamable_http_server/tower.rs allows an unauthenticated client to send a well-formed JSON-RPC POST that is not an initialization request, or an initialization request with a mismatched protocol header, causing StreamableHttpService::handle_post to call LocalSessionManager.create_session before validating the message. An early validation failure returns without removing the inserted LocalSessionHandle from LocalSessionManager.sessions, permanently retaining session and channel state for the server process lifetime. Repeated requests can grow the shared session table without bound, degrade legitimate-client latency through lock contention, exhaust memory, and terminate the server. This issue is fixed in version 2.0.0.

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:80764 advisory.

    For details on how to apply this update, which includes the changes     described in this advisory, refer to: https://access.redhat.com/articles/11258

    Security Fix(es):

    * goose: Arbitrary command execution via malicious Git configuration     in `goose review` (CVE-2026-72718)

    * goose: RMCP: Token impersonation via missing OAuth resource field     validation (CVE-2026-63127)

    * goose: RMCP: Denial of Service via unauthenticated session table     leak (CVE-2026-63128)

    * goose: rustls-webpki: Denial of Service via crafted Certificate     Revocation List (CVE-2026-93599)

    For more details about the security issue(s), including the impact,     a CVSS score, acknowledgments, and other related information, refer     to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:80765 advisory.

    For details on how to apply this update, which includes the changes     described in this advisory, refer to: https://access.redhat.com/articles/11258

    Security Fix(es):

    * goose: Arbitrary command execution via malicious Git configuration     in `goose review` (CVE-2026-72718)

    * goose: RMCP: Token impersonation via missing OAuth resource field     validation (CVE-2026-63127)

    * goose: RMCP: Denial of Service via unauthenticated session table     leak (CVE-2026-63128)

    * goose: rustls-webpki: Denial of Service via crafted Certificate     Revocation List (CVE-2026-93599)

    For more details about the security issue(s), including the impact,     a CVSS score, acknowledgments, and other related information, refer     to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful     Streamable HTTP server in crates/rmcp/src/transport/streamable_http_server/tower.rs allows an     unauthenticated client to send a well-formed JSON-RPC POST that is not an initialization request, or an     initialization request with a mismatched protocol header, causing StreamableHttpService::handle_post to     call LocalSessionManager.create_session before validating the message. An early validation failure returns     without removing the inserted LocalSessionHandle from LocalSessionManager.sessions, permanently retaining     session and channel state for the server process lifetime. Repeated requests can grow the shared session     table without bound, degrade legitimate-client latency through lock contention, exhaust memory, and     terminate the server. This issue is fixed in version 2.0.0. (CVE-2026-63128)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
369252	RHEL 9 : goose (RHSA-2026:80764)	Nessus	Red Hat Local Security Checks	Local	high
369251	RHEL 10 : goose (RHSA-2026:80765)	Nessus	Red Hat Local Security Checks	Local	high
346365	Linux Distros Unpatched Vulnerability : CVE-2026-63128	Nessus	Misc.	Local	high

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CVE-2026-63128

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Tenable Plugins

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