CVE-2026-27139— FileInfo can escape from a Root in os
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I. Basic Information for CVE-2026-27139
Vulnerability Information
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Vulnerability Title
FileInfo can escape from a Root in os
Source: NVD (National Vulnerability Database)
Vulnerability Description
On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于在Unix平台上使用File.ReadDir或File.Readdir列出目录内容时，返回的FileInfo可能引用Root之外的文件，可能导致从文件系统任意位置读取元数据。
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 standard library | os | 0 ~ 1.25.8 | - |
II. Public POCs for CVE-2026-27139
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Go standard library · 2026-03-06 · 5 CVEs total
| CVE-2026-25679 | Incorrect parsing of IPv6 host literals in net/url | |
| CVE-2026-27138 | Panic in name constraint checking for malformed certificates in crypto/x509 | |
| CVE-2026-27137 | Incorrect enforcement of email constraints in crypto/x509 | |
| CVE-2026-27142 | URLs in meta content attribute actions are not escaped in html/template |
IV. Related Vulnerabilities
Same vendor: Go standard library
- CVE-2026-39823
Bypass of meta content URL escaping causes XSS in html/templ - CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mai - CVE-2026-42499
Quadratic string concatenation in consumePhrase in net/mail - CVE-2026-33811
Crash when handling long CNAME response in net - CVE-2026-39826
Escaper bypass leads to XSS in html/template
V. Comments for CVE-2026-27139
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