CVE-2026-46383CWE-22CWE-73

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

Medium · published May 15, 2026

CVSS v3.1
5.5
EPSS
1%
Percentile
59.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00899 · 59.2th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-73 · External Control of File Name or Path
Published
2026-05-15T16:04Z
EPSS history
Timeline
  • 15 MAY 16:04Z
    Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`
    cvelistv5