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CVE-2026-85396— rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix

Quick assessment

Affected
rubyzip rubyzip
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.

rubyzip是rubyzip组织的一个压缩文件处理库。 rubyzip 3.4.0之前版本存在路径遍历漏洞，该漏洞源于Zip::Entry#extract在提取路径验证中使用不带尾部分隔符的前缀比较，导致路径遍历，攻击者可利用特制归档条目（如../upload_backup/owned.sh）将文件写入预期提取目录之外共享目标前缀的兄弟路径。

CVSS 7.5 · High EPSS 0.56% · P46

Possible ATT&CK Techniques 1 AI

T1079.001

Affected Version Matrix 2

VendorProduct Version RangeStatus
rubyzip rubyzip < 3.4.0 affected
3.4.0 unaffected
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I. Basic Information for CVE-2026-85396

Vulnerability Information
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Vulnerability Title
rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix
Source: CVE Program / CVE List V5
Vulnerability Description
rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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
rubyzip 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rubyzip是rubyzip组织的一个压缩文件处理库。 rubyzip 3.4.0之前版本存在路径遍历漏洞，该漏洞源于Zip::Entry#extract在提取路径验证中使用不带尾部分隔符的前缀比较，导致路径遍历，攻击者可利用特制归档条目（如../upload_backup/owned.sh）将文件写入预期提取目录之外共享目标前缀的兄弟路径。
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
rubyzip rubyzip 0 ~ 3.4.0 -

II. Public POCs for CVE-2026-85396

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III. Intelligence Information for CVE-2026-85396

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Patches & Fixes for CVE-2026-85396 (1)

Vendor Advisories for CVE-2026-85396 (1)

Security Blog Posts for CVE-2026-85396 (1)

Vendor Pages for CVE-2026-85396 (2)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-85396

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