CVE-2025-53366General

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.9.4, a validation error in the MCP SDK can cause an unhandled exception when processing malformed requests, resulting in service unavailability (500 errors) until manually restarted. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.9.4 contains a patch for the issue.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-248

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

General: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

General

1100.0%

Referenced assets1 URL

By indicator

https://github.com/microsoft/markitdown

Full discourse1 post

Veros@boldnames180d
General
Don't just take my word for it, verify. We scanned a trending public Github repository by @Microsoft at microsoft/markitdown and found 2 critical OSVs interlinked to 6 CVEs, among other findings: https://github.com/microsoft/markitdown Dependencies: Pillow>=9.0.0 -> CVE-2023-50447, CVE-2024-28219, CVE-2023-44271. mcp~=1.8.0 -> CVE-2025-53366, CVE-2025-66416, CVE-2025-53365. Per this post, the dependency still exist at > >markitdown-ocr/pyproject.toml >markitdown-mcp/pyproject.toml
Post summary
The author reports six CVEs associated with dependencies in the microsoft/markitdown repository but provides no PoC, exploit, mitigation, or technical detail.
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