TI-2026-34097 Aliases CVE-2026-46383 GHSA-mq5j-pw29-jcv3

Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`

MEDIUM 58CWE-22Published 2026-05-15 · Updated 2026-05-15

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Microsoft APM is an open-source, community-driven dependency manager for AI agents. Prior to 0.13.0, Microsoft APM contains a Windows-specific archive extraction boundary failure in the legacy-bundle probe used by apm install <bundle> on supported Python 3.10 and 3.11 runtimes. When apm install is given a local .tar.gz that is not recognized as a plugin-format bundle, APM probes whether it is a legacy --format apm bundle. On Python versions earlier than 3.12, that probe extracts untrusted tar members with raw tar.extractall() without rejecting Windows absolute member names such as D:/.... This vulnerability is fixed in 0.13.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0045 39th percentileScored 2026-11-07

Fix Fixed apm (microsoft): 0.13.0apm-cli (PyPI): 0.13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Microsoft	apm	before 0.13.0	0.13.0	Patch available	CNA
—	apm-cli (PyPI)	before 0.13.0	0.13.0	Patch available	GHSA-mq5j-pw29-jcv3

apm VendorMicrosoft Affected before 0.13.0 Fixed in 0.13.0 Patch available CNA
apm-cli (PyPI) Vendor— Affected before 0.13.0 Fixed in 0.13.0 Patch available GHSA-mq5j-pw29-jcv3

Remediation

Fix · CNA apm (microsoft) Fixed in 0.13.0
Fix · GHSA-mq5j-pw29-jcv3 apm-cli (PyPI) Fixed in 0.13.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-46383
2026-10-03 Alias added: GHSA-mq5j-pw29-jcv3
2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-46383

Other 4

TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8

See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences