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CVE-2026-41861— Arbitrary Root File Write via Path Traversal in BOSH agent

Quick assessment

Affected
CloudFoundry Foundation BOSH
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.

BOSH 生态系统中的路径穿越漏洞：BOSH 允许一个 IaaS 元数据攻击者通过 Ubuntu 上的网络别名，使 BOSH 代理向任何以 结尾的路径写入一个所有者为 root、且内容部分由攻击者控制的文件，并以模式 0777 创建所有缺失的父目录。 受影响版本：BOSH 代理 < v2.847.0（jammy <= v1.1202，或 noble <= v1.364）。安全公告中未指定下限版本（“所有 BOSH 代理版本”）。

CVSS 4.2 · Medium EPSS 0.21% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
CloudFoundry Foundation BOSH < 2.847.0 affected
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I. Basic Information for CVE-2026-41861

Vulnerability Information
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Vulnerability Title
Arbitrary Root File Write via Path Traversal in BOSH agent
Source: CVE Program / CVE List V5
Vulnerability Description
Path Traversal in BOSH-Ecosystem / BOSH allows an IaaS-metadata attacker to make the agent write a root-owned file with partially attacker-controlled body to any path ending in .network, and create any missing parent directories with mode 0777 via network Alias on Ubuntu. Affected versions: BOSH agent < v2.847.0 (jammy <= v1.1202, or noble <= v1.364). Lower bound unspecified in advisory ("All bosh agent versions").
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
CloudFoundry Foundation BOSH 0 ~ 2.847.0 -

II. Public POCs for CVE-2026-41861

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III. Intelligence Information for CVE-2026-41861

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Security Blog Posts for CVE-2026-41861 (1)

IV. Related Vulnerabilities

Same product: BOSH
Same vendor: CloudFoundry Foundation
Same weakness: CWE-22

V. Comments for CVE-2026-41861

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