CVE-2026-18953

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://aws.amazon.com/security/security-bulletins/2026-075-aws/	Vendor Advisory
https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw	Vendor Advisory
https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/	Product

Configurations

Configuration 1 (hide)

cpe:2.3:a:amazon:aws_transform_mcp_server:*:*:*:*:*:python:*:*

History

10 Aug 2026, 13:12

Type	Values Removed	Values Added
First Time		Amazon Amazon aws Transform Mcp Server
References	~~() https://aws.amazon.com/security/security-bulletins/2026-075-aws/ -~~	() https://aws.amazon.com/security/security-bulletins/2026-075-aws/ - Vendor Advisory
References	~~() https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw -~~	() https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw - Vendor Advisory
References	~~() https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/ -~~	() https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/ - Product
CPE		cpe:2.3:a:amazon:aws_transform_mcp_server::::::python::*

05 Aug 2026, 21:16

Type	Values Removed	Values Added
References		() https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw -

05 Aug 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-08-05 20:17

Updated : 2026-08-10 13:12

NVD link : CVE-2026-18953

Mitre link : CVE-2026-18953

CVE.ORG link : CVE-2026-18953

JSON object : View

Products Affected

amazon

aws_transform_mcp_server

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

{"id": "CVE-2026-18953", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18953", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-06T14:51:32.807113Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}], "cvssMetricV40": [{"type": "Secondary", "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5", "affectedData": [{"vendor": "AWS", "product": "aws-transform-mcp-server", "versions": [{"status": "affected", "version": "0.1.0", "versionType": "custom", "lessThanOrEqual": "0.1.4"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-05T20:17:07.770", "references": [{"url": "https://aws.amazon.com/security/security-bulletins/2026-075-aws/", "tags": ["Vendor Advisory"], "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"}, {"url": "https://github.com/awslabs/mcp/security/advisories/GHSA-66mr-jr63-2jgw", "tags": ["Vendor Advisory"], "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"}, {"url": "https://pypi.org/project/awslabs.aws-transform-mcp-server/0.1.5/", "tags": ["Product"], "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5", "description": [{"lang": "en", "value": "CWE-22"}]}], "descriptions": [{"lang": "en", "value": "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.\n\n\n\nTo remediate this issue, users should upgrade to version 0.1.5 or later."}], "lastModified": "2026-08-10T13:12:47.973", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:amazon:aws_transform_mcp_server:*:*:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "D9236C77-5A1C-4240-AE46-2E8026BDD363", "versionEndExcluding": "0.1.5", "versionStartIncluding": "0.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5"}