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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 版本低于 3.4.0 存在一个路径遍历（Path Traversal）漏洞，位于 方法中。该漏洞的成因是：在验证解压路径时，使用不带尾部分隔符的前缀比较方式，未能正确校验解压路径。 攻击者可以构造存档条目，例如将文件名设为 ，从而将文件写入目标目录之外的同级路径（即共享目标前缀的相邻目录）。

CVSS 7.5 · High

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

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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