Vulnerability · Published May 15, 2026 · Assigned by GitHub_M
CVE-2026-46383Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`
Medium 5.5
In plain English
A medium-severity path traversal in apm from microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | apm-cli | 0.13.0 | GHSA-mq5j-pw29-jcv3 |
| PyPI | apm-cli | 0.13.0 | PYSEC-2026-2378 |
Affected products (as reported)
Weakness: CWE-22, CWE-73 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
References
- https://github.com/microsoft/apm/security/advisories/GHSA-mq5j-pw29-jcv3 x_refsource_CONFIRM