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CVE-2026-66484— Path Traversal in GNU cpio

Quick assessment

Affected
GNU cpio
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.

GNU cpio是美国GNU基金会开源的一款文件归档与提取工具。 GNU cpio 2.15及之前版本存在路径遍历漏洞，该漏洞源于提取tar归档时，使用--no-absolute-filenames选项处理硬链接目标路径时未进行充分清理，可能允许攻击者创建指向提取目录外部文件的硬链接。

CVSS 4.6 · Medium EPSS 0.20% · P8

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU cpio ≤ 2.15 affected
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I. Basic Information for CVE-2026-66484

Vulnerability Information
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Vulnerability Title
Path Traversal in GNU cpio
Source: CVE Program / CVE List V5
Vulnerability Description
GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the link_to_name function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files. This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA: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
GNU cpio 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU cpio是美国GNU基金会开源的一款文件归档与提取工具。 GNU cpio 2.15及之前版本存在路径遍历漏洞，该漏洞源于提取tar归档时，使用--no-absolute-filenames选项处理硬链接目标路径时未进行充分清理，可能允许攻击者创建指向提取目录外部文件的硬链接。
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
GNU cpio 0 ~ 2.15 -

II. Public POCs for CVE-2026-66484

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III. Intelligence Information for CVE-2026-66484

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Patches & Fixes for CVE-2026-66484 (1)

Security Blog Posts for CVE-2026-66484 (1)

Same Patch Batch · GNU · 2026-08-10 · 7 CVEs total

CVE-2026-71392 5.3 MEDIUM Integer Overflow in GNU Emacs for Android
CVE-2026-71393 5.3 MEDIUM Heap Buffer Overflow in GNU Emacs for Android
CVE-2026-71391 5.3 MEDIUM Off-by-One Error in GNU Emacs for Android
CVE-2026-71394 5.3 MEDIUM Heap Use of Uninitialized Memory in GNU Emacs for Android
CVE-2026-66486 4.6 MEDIUM Improper Output Encoding in GNU cpio
CVE-2026-66485 4.6 MEDIUM Uncontrolled Memory Allocation in GNU cpio

IV. Related Vulnerabilities

Same product: cpio
Same vendor: GNU
Same weakness: CWE-22

V. Comments for CVE-2026-66484

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