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CVE-2026-44973— Billy: Path traversal vulnerabilities

Quick assessment

Affected
go-git go-billy
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

go-billy是go-git开源的一个文件系统抽象接口库。 go-billy 5.9.0之前版本存在路径遍历漏洞，该漏洞源于多个组件中存在路径遍历问题，路径清理和边界执行不足可能导致访问意外文件系统位置。

CVSS 8.1 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
go-git go-billy < 5.9.0 affected
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I. Basic Information for CVE-2026-44973

Vulnerability Information
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Vulnerability Title
Billy: Path traversal vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
Billy is an interface filesystem abstraction for Go. Prior to 5.9.0, multiple path traversal issues exist across different components of go-billy. Insufficient path sanitization and boundary enforcement may allow crafted paths (e.g., using ..) to escape intended base directories. While go-billy was not originally designed to provide a strong security boundary, some of these issues were inconsistent across some of the built-in implementations. This results in scenarios where applications relying on go-billy for some level of isolation may inadvertently expose access to unintended filesystem locations. This vulnerability is fixed in 5.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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
go-billy 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
go-billy是go-git开源的一个文件系统抽象接口库。 go-billy 5.9.0之前版本存在路径遍历漏洞，该漏洞源于多个组件中存在路径遍历问题，路径清理和边界执行不足可能导致访问意外文件系统位置。
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
go-git go-billy < 5.9.0 -

II. Public POCs for CVE-2026-44973

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8560 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44973

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Vendor Advisories for CVE-2026-44973 (1)

IV. Related Vulnerabilities

Same product: go-billy
Same vendor: go-git
Same weakness: CWE-22

V. Comments for CVE-2026-44973

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