What’s Vulnerable › Vulnerabilities

CVE-2026-46383: Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-15 · updated 2026-10-26
• Weakness: CWE-22

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 products

• microsoft apm: before 0.13.0

References

• https://github.com/microsoft/apm/security/advisories/GHSA-mq5j-pw29-jcv3
• https://github.com/microsoft/apm/security/advisories/GHSA-mq5j-pw29-jcv3

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