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CVE-2026-109527

HIGH 7.5

Published 2026-10-14 · Last modified 2026-10-20

The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. In mcp versions before 1.29.1 and from 2.0.0a1 through 2.0.1, the Streamable HTTP session manager, SSE message endpoint, and OAuth authorization-server routes buffer complete HTTP request bodies without enforcing a maximum size. An unauthenticated remote client able to reach an affected endpoint can send a large declared or streamed request body that consumes multiple times the body size in process memory and can repeatedly exhaust memory or terminate the server. Stdio-only servers and deployments with an effective upstream request-size limit are not affected, and applications that use StreamableHTTPServerTransport directly remain responsible for enforcing their own limit. The standard SDK server applications and session managers are fixed in versions 1.29.1 and 2.1.0.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.7%chance of exploitation in 30 days · 53rd percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Modelcontextprotocol

Products Python Sdk

Weakness (CWE)

  • CWE-770: : Allocation of Resources Without Limits or Throttling

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References and research data (JSON)

Vendor product assessments

Showing 32 of 46 vendor product statements; 14 omitted. Read the full vendor advisory.

  • ansible-automation-platform/automation-orchestrator-backend-rhel9 as a component of Ansible Automation Orchestrator 2026 · known affected

    Vendor assessment for this product only.

    pkg:oci/automation-orchestrator-backend-rhel9@sha256:93abb3e4ab9571eb09b2de296321d12fdb38d2fa3c32c13cd304ab0db062e591?repository_url=registry.redhat.io/ansible-automation-platform/automation-orchestrator-backend-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · known affected

    Vendor assessment for this product only.

    pkg:oci/lightspeed-stack-rhel9@sha256:c8b39c58ade51ce26698f5d3c8d302e2e039f05ff14e014b17da2cba0f8c8068?repository_url=registry.redhat.io/lightspeed-core/lightspeed-stack-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • lightspeed-core/rag-tool-cpu-rhel9 as a component of Lightspeed Core · known affected

    Vendor assessment for this product only.

    pkg:oci/rag-tool-cpu-rhel9@sha256:ec8e42910dd3a7109d90bf77bb47e198a1580875117dc4b5365b5a85d2d8325c?repository_url=registry.redhat.io/lightspeed-core/rag-tool-cpu-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8 · known affected

    Vendor assessment for this product only.

    pkg:oci/mta-solution-server-rhel9@sha256:ee4dbe222bd778ef272ddf3e59dac0844289cc719cd87dea1e24df74f344e097?repository_url=registry.redhat.io/mta/mta-solution-server-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • openshift-lightspeed/lightspeed-agentic-sandbox-rhel9 as a component of OpenShift Lightspeed · known affected

    Vendor assessment for this product only.

    pkg:oci/lightspeed-agentic-sandbox-rhel9@sha256:d40dff970b3c17d3e0edb23b09da9ae08bac9d3eb81887eae358e041e1923b54?repository_url=registry.redhat.io/openshift-lightspeed/lightspeed-agentic-sandbox-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaii/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cpu-rhel9@sha256:81c5994dc20321f8bd3969099eade78ef127cbd79f2d0ccea101c773e4c7fa4d?repository_url=registry.redhat.io/rhaii/vllm-cpu-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaii/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-cuda-rhel9@sha256:0d22e2301ce26ef68effda5d3a4a20381ad0ea34d1240e159e245bd44c2e125b?repository_url=registry.redhat.io/rhaii/vllm-cuda-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaii/vllm-neuron-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-neuron-rhel9@sha256:1079c9afecdbc33f4790792f0d712dbf7523790a92dcfbe8fb5cf4c2d282fc5b?repository_url=registry.redhat.io/rhaii/vllm-neuron-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaii/vllm-rocm-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-rocm-rhel9@sha256:1a30359d6ca5d0891e403b9b0a23c0ae1ad6e30a2429b9b42e246b874fe8859a?repository_url=registry.redhat.io/rhaii/vllm-rocm-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaii/vllm-tpu-rhel9 as a component of Red Hat AI Inference Server · known affected

    Vendor assessment for this product only.

    pkg:oci/vllm-tpu-rhel9@sha256:0c2ac747d67dc0e80162ff05867dd702e474b2217659f19f28b8e3a0c03a942a?repository_url=registry.redhat.io/rhaii/vllm-tpu-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • ansible-automation-platform-26/mcp-tools-rhel9 as a component of Red Hat Ansible Automation Platform 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/mcp-tools-rhel9@sha256:0dcdca84ec4a9430360a262126095e1a06646137d96806bde5cc226733ffbca3?repository_url=registry.redhat.io/ansible-automation-platform-26/mcp-tools-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • ansible-automation-platform-27/lightspeed-chatbot-rhel9 as a component of Red Hat Ansible Automation Platform 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/lightspeed-chatbot-rhel9@sha256:90ab0d048385b72c760d57c2eb194dfbc0224176e3bd8fc0dccb31eebf6fe8c5?repository_url=registry.redhat.io/ansible-automation-platform-27/lightspeed-chatbot-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhelai3/bootc-aws-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-aws-cuda-rhel9@sha256:06b1e9b7df858121b6f339a5e78de93307be96c191a1c3e6df50cfeffaf9df15?repository_url=registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhelai3/bootc-azure-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-azure-cuda-rhel9@sha256:698d9e34aaf479d0149ea75b841dacbe0117ba2e3718a7088ac98ea6b081792e?repository_url=registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhelai3/bootc-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-cuda-rhel9@sha256:e0fbb896811ab54d183e23612030072b946674824bad697bf2b3f68362651662?repository_url=registry.redhat.io/rhelai3/bootc-cuda-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhelai3/bootc-gaudi-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-gaudi-rhel9@sha256:e1057b59ca1be9501332abf97230855e85c7df858356be0da9dce230ea7e98e1?repository_url=registry.redhat.io/rhelai3/bootc-gaudi-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhelai3/bootc-rocm-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-rocm-rhel9@sha256:8fe5203e86917e5f829bd64b831cad31536d23a213b4bfe31e652577ad0faf2e?repository_url=registry.redhat.io/rhelai3/bootc-rocm-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhai-early-access/docling-serve-cuda-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/docling-serve-cuda-rhel9@sha256:d4393882dd9adc9ee6fd03265bb20d90944906a4fa6b37db5b0a47df36ebac75?repository_url=registry.redhat.io/rhai-early-access/docling-serve-cuda-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-feature-server-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-feature-server-rhel9@sha256:c5dd868cd66e7911969f60658d31b3714ed42f0e81b9512f89991a412bcb0fa9?repository_url=registry.redhat.io/rhoai/odh-feature-server-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-kserve-controller-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-controller-rhel9@sha256:c15f0cdab6447446384bbd911bd48368839d0eb20c02e287236e6c905bf34cba?repository_url=registry.redhat.io/rhoai/odh-kserve-controller-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-kserve-router-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-kserve-router-rhel9@sha256:0e46fd236b218fb33ffe90592f67b50d2f286356f23ecc2c4ec5ae67fa64b57a?repository_url=registry.redhat.io/rhoai/odh-kserve-router-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-llama-stack-core-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-llama-stack-core-rhel9@sha256:e60cc260f4d1434443572e4ca096b9c1daccd0f046803d716f0521856e837151?repository_url=registry.redhat.io/rhoai/odh-llama-stack-core-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-llm-d-kv-cache-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-llm-d-kv-cache-rhel9@sha256:cb5eedeefd2578cd9bd8637250bbe299c84539f57b4ead75d630ed9f833a6ef2?repository_url=registry.redhat.io/rhoai/odh-llm-d-kv-cache-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-th-torch-cuda-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-th-torch-cuda-py312-rhel9@sha256:efd7b3607b699092c68359d20ef0d0043114191a097637667c0d2cf78fbea702?repository_url=registry.redhat.io/rhoai/odh-th-torch-cuda-py312-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-trustyai-garak-lls-provider-dsp-rhel9@sha256:63d2a0d4195c108c2957445ca81e176b8af8e1246205a0c9d1f56d5884aacd29?repository_url=registry.redhat.io/rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • satellite/foreman-mcp-server-rhel9 as a component of Red Hat Satellite 6 · known affected

    Vendor assessment for this product only.

    pkg:oci/foreman-mcp-server-rhel9@sha256:a2a11b050f7e0b7ea0ebf07d159eef351b3d8ef44c5d5b166b9975e9e513074f?repository_url=registry.redhat.io/satellite/foreman-mcp-server-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaiis/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/vllm-cpu-rhel9@sha256:fb7791bbfea99e9f81529fe8cc1e7c834ca470585c27590e3d0a6834167cd436?repository_url=registry.redhat.io/rhaiis/vllm-cpu-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaiis/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/vllm-cuda-rhel9@sha256:73bbc4560132c4aaa9bbd608ce9560eeae7b30bcc8f014da460afa5622139372?repository_url=registry.redhat.io/rhaiis/vllm-cuda-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaiis/vllm-rocm-rhel9 as a component of Red Hat AI Inference Server · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/vllm-rocm-rhel9@sha256:37b64a8df90756aae0ee96d2f07765adbce5ed5beb2414ac3845806ad2219cfc?repository_url=registry.redhat.io/rhaiis/vllm-rocm-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhaiis/vllm-tpu-rhel9 as a component of Red Hat AI Inference Server · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/vllm-tpu-rhel9@sha256:b1c12112a1e8a298645e10d34d44c9961a6121aa8d87fc5d65ad83e1ffa3c586?repository_url=registry.redhat.io/rhaiis/vllm-tpu-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-openvino-model-server-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known not affected

    Vendor assessment for this product only.

    Reason: component not present

    pkg:oci/odh-openvino-model-server-rhel9@sha256:725ffc572dcbb3a515b9dbd3336c1c663f025aacc5f0ebe2f3a4836765d45055?repository_url=registry.redhat.io/rhoai/odh-openvino-model-server-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00
  • rhoai/odh-vllm-gaudi-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/odh-vllm-gaudi-rhel9@sha256:87eec3862eb6ddef445f89dcf6fd89add7ef202ea7c563b1ee7347537fb3e250?repository_url=registry.redhat.io/rhoai/odh-vllm-gaudi-rhel9

    Red Hat · CVE-2026-109527 · Updated 2026-10-20T19:54:00+00:00

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS