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

Quick assessment

Affected
microsoft apm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

APM – Agent Package Manager是Microsoft开源的一款AI代理依赖管理工具。 APM – Agent Package Manager 0.13.0之前版本存在路径遍历漏洞，该漏洞源于Windows特定的归档提取边界失败，在Python 3.10和3.11运行时上使用apm install时，对本地.tar.gz文件进行遗留格式探测时使用raw tar.extractall提取不受信任的tar成员，未拒绝Windows绝对成员名，可能导致任意文件写入。

CVSS 5.5 · Medium EPSS 0.90% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
microsoft apm < 0.13.0 affected
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I. Basic Information for CVE-2026-46383

Vulnerability Information
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Vulnerability Title
Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in `apm install`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
APM – Agent Package Manager 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
APM – Agent Package Manager是Microsoft开源的一款AI代理依赖管理工具。 APM – Agent Package Manager 0.13.0之前版本存在路径遍历漏洞，该漏洞源于Windows特定的归档提取边界失败，在Python 3.10和3.11运行时上使用apm install时，对本地.tar.gz文件进行遗留格式探测时使用raw tar.extractall提取不受信任的tar成员，未拒绝Windows绝对成员名，可能导致任意文件写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
microsoft apm < 0.13.0 -

II. Public POCs for CVE-2026-46383

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III. Intelligence Information for CVE-2026-46383

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Vendor Advisories for CVE-2026-46383 (1)

Same Patch Batch · microsoft · 2026-05-15 · 3 CVEs total

CVE-2026-45539 7.4 HIGH Microsoft APM: Symlinks under `.apm/prompts/` and `.apm/agents/` are dereferenced during `
CVE-2026-44641 7.1 HIGH Microsoft APM: plugin.json component paths escape plugin root and copy arbitrary host file

IV. Related Vulnerabilities

Same product: apm
Same vendor: microsoft
Same weakness: CWE-22

V. Comments for CVE-2026-46383

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