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CVE-2026-66485— Uncontrolled Memory Allocation 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及之前版本存在资源管理错误漏洞，该漏洞源于src/makepath.c文件的make_path函数中不受控制的内存分配，使用alloca基于argpath长度分配栈内存，恶意cpio存档中包含超长嵌套路径名可导致未绑定的栈分配，造成栈溢出和崩溃，从而导致拒绝服务。

CVSS 4.6 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU cpio ≤ 2.15 affected
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I. Basic Information for CVE-2026-66485

Vulnerability Information
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Vulnerability Title
Uncontrolled Memory Allocation in GNU cpio
Source: CVE Program / CVE List V5
Vulnerability Description
GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
GNU cpio 资源管理错误漏洞
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及之前版本存在资源管理错误漏洞，该漏洞源于src/makepath.c文件的make_path函数中不受控制的内存分配，使用alloca基于argpath长度分配栈内存，恶意cpio存档中包含超长嵌套路径名可导致未绑定的栈分配，造成栈溢出和崩溃，从而导致拒绝服务。
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-2026-66485

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III. Intelligence Information for CVE-2026-66485

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Patches & Fixes for CVE-2026-66485 (1)

Security Blog Posts for CVE-2026-66485 (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-2026-66484 4.6 MEDIUM Path Traversal in GNU cpio
CVE-2026-66486 4.6 MEDIUM Improper Output Encoding in GNU cpio

IV. Related Vulnerabilities

Same product: cpio
Same vendor: GNU
Same weakness: CWE-789

V. Comments for CVE-2026-66485

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