CVE-2026-46383
Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`
MEDIUM 5.5EPSS 0.9%
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
- microsoft · apm
- CVSS v3.1 GITHUB
- 5.5 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - EPSS
- 0.90% chance of exploitation in the next 30 days, 59th percentile
- Published
- 2026-05-15