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Tool Directory

CVE-2026-18953

MediumPublished

Improper limitation of a pathname to a restricted directory in aws-transform-mcp-server

Published: Aug 5, 2026
Updated: Aug 6, 2026
Assigning CNA: AMZN
Evidence observed: Aug 8, 2026

Primary CVSS

6.3/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 11.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Improper limitation of a pathname to a restricted directory in the get_resource tool in Amazon awslabs.aws-transform-mcp-server 0.1.0 through 0.1.4 might allow a context-dependent actor to write arbitrary files outside the intended working directory via the savePath parameter. To remediate this issue, users should upgrade to version 0.1.5 or later.

Sources

CVE-2026-18953PoC
PoC for CVE-2026-18953 — arbitrary file write (CWE-22) in awslabs.aws-transform-mcp-server's get_resource tool via the savePath parameter

Responsible use

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