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CVE-2026-44740— go-billy: Lack of depth and cycle detection in symlink resolution may lead to infinite loops and resource exhaustion

Quick assessment

Affected
go-git go-billy
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.

go-billy是go-git开源的一个文件系统抽象接口库。 go-billy 5.9.0之前版本和6.0.0-alpha.1之前版本存在安全漏洞，该漏洞源于多个组件对特制或畸形输入处理不当，可能导致崩溃、无限循环、不受控制的递归或资源消耗过多。

CVSS 6.5 · Medium EPSS 0.39% · P32

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
go-git go-billy < 5.9.0 affected
< 6.0.0-alpha.1 affected
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I. Basic Information for CVE-2026-44740

Vulnerability Information
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Vulnerability Title
go-billy: Lack of depth and cycle detection in symlink resolution may lead to infinite loops and resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Billy is an interface filesystem abstraction for Go. Prior to versions 5.9.0 and 6.0.0-alpha.1, multiple components may improperly handle crafted or malformed input, resulting in panics, infinite loops, uncontrolled recursion, or excessive resource consumption. These issues arise from insufficient validation and missing safety mechanisms such as cycle detection, recursion limits, or defensive handling of unexpected states when processing untrusted repository data and filesystem structures. This issue has been patched in versions 5.9.0 and 6.0.0-alpha.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
go-billy 安全漏洞
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之前版本和6.0.0-alpha.1之前版本存在安全漏洞，该漏洞源于多个组件对特制或畸形输入处理不当，可能导致崩溃、无限循环、不受控制的递归或资源消耗过多。
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-2026-44740

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III. Intelligence Information for CVE-2026-44740

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Vendor Advisories for CVE-2026-44740 (1)

Vendor Pages for CVE-2026-44740 (2)

IV. Related Vulnerabilities

Same product: go-billy
Same vendor: go-git
Same weakness: CWE-674

V. Comments for CVE-2026-44740

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