CVE-2026-51997 geelen CVE debrief

Who should care

Defenders responsible for systems or applications using geelen mcp-remote versions 0.1.16 through 0.1.38 should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the affected versions of mcp-remote and apply patches or mitigations as available. They should also review compensating controls for exposed systems and monitor for any

Why it matters

CVE-2026-51997 is a high-severity remote code execution vulnerability in geelen mcp-remote versions 0.1.16 through 0.1.38. Defenders should prioritize verifying the affected versions and applying patches or mitigations as available.

• Remote code execution could lead to unauthorized access and control of affected systems.
• Successful exploitation could result in data breaches or system compromise.
• Defenders need to verify the affected versions of mcp-remote and apply patches or mitigations as available.

Technical summary

The vulnerability exists in geelen mcp-remote versions 0.1.16 through 0.1.38 and allows a remote attacker to execute arbitrary code via the open() functions. The CVSS score for this vulnerability is 8.8, indicating a high severity level. This issue arises from the open() functions in mcp-remote, which can be exploited remotely, potentially leading to unauthorized access and control of affected systems. Defenders should prioritize verifying the affected versions and applying patches or mitigations as available. The vulnerability is a high-severity remote code execution vulnerability.

Defensive priority

Defenders should prioritize verifying the affected versions of mcp-remote and applying patches or mitigations as available.

Recommended defensive actions

• Verify the version of mcp-remote in use and check if it is within the affected range (0.1.16 through 0.1.38).
• Apply patches or mitigations as available from the vendor.
• Monitor for any suspicious activity related to the open() functions in mcp-remote.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected versions. The vulnerability exists in geelen mcp-remote versions 0.1.16 through 0.1.38. The open() functions in mcp-remote are the source of the vulnerability. Defenders need to verify the affected versions of mcp-remote and apply patches or mitigations as available. The source references provide additional information on the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.