Read the docs
TI-2026-45066 Aliases CVE-2026-63128GHSA-9pj6-vhgr-3mwh

Uncontrolled resource consumption in MLflow rust-sdk

Priority HIGH 66CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00535 45th percentileScored 2026-11-07
Fix Partial rust-sdk (modelcontextprotocol): 2.0.0rmcp (crates.io): 2.0.0Red Hat: 2 advisoriesRed Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MLflowrust-sdkbefore 2.0.02.0.0Patch availableCNA
—rmcp (crates.io)before 2.0.02.0.0Patch availableGHSA-9pj6-vhgr-3mwh
  • rust-sdk VendorMLflow Affected before 2.0.0 Fixed in 2.0.0 Patch available CNA
  • rmcp (crates.io) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-9pj6-vhgr-3mwh

Remediation

  • Fix · CNA rust-sdk (modelcontextprotocol) Fixed in 2.0.0
  • Fix · GHSA-9pj6-vhgr-3mwh rmcp (crates.io) Fixed in 2.0.0 Advisory →

Red Hat 2 advisories

  • RHSA-2026:80765 Released 2026-10-12 · Red Hat rating Important
    goose security update
    • Red Hat Enterprise Linux Extensions Channel (v. 10) goose-1.45.0-1.el10_2
  • RHSA-2026:80764 Released 2026-10-12 · Red Hat rating Important
    goose security update
    • Red Hat Enterprise Linux Extensions Channel (v. 9) goose-1.45.0-1.el9_8

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63128
  2. 2026-10-03 Alias added: GHSA-9pj6-vhgr-3mwh
  3. 2026-10-12 Fix available: RHSA-2026:80765 · Red Hat
  4. 2026-10-12 Fix available: RHSA-2026:80764 · Red Hat

References

Advisory 1

Other 5

  • TI-2026-46366 Server-side request forgery in mlflow KEVCVSS 3.1CRITICAL 9.3
  • TI-2023-03518 Absolute Path Traversal in mlflow/mlflow CVSS 3.1CRITICAL 10.0
  • TI-2023-01113 Path Traversal: '\..\filename' in mlflow/mlflow CVSS 3.1CRITICAL 9.8
  • TI-2025-31759 Redis Lua Use-After-Free may lead to remote code execution CVSS 3.1CRITICAL 10.0
  • TI-2026-81527 Code execution via scorer deserialization in MLflow servers CVSS 3.1CRITICAL 9.8
  • TI-2025-14028 Command Injection in mlflow/mlflow CVSS 3.1CRITICAL 10.0
See all 175 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences