CVE-2026-46383: Microsoft APM

Medium severity, CVSS 5.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Microsoft APM: before 0.13.0 (fixed in 0.13.0)

Published 2026-05-15. Last modified 2026-06-17.