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CVE-2026-66486— Improper Output Encoding 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及之前版本存在输出处理不当漏洞，该漏洞源于归档成员列表功能对输出编码或转义不当，可能导致攻击者构造包含换行符或ANSI转义序列的cpio归档，造成伪造列表条目或终端控制序列注入。

CVSS 4.6 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU cpio ≤ 2.15 affected
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I. Basic Information for CVE-2026-66486

Vulnerability Information
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Vulnerability Title
Improper Output Encoding in GNU cpio
Source: CVE Program / CVE List V5
Vulnerability Description
GNU cpio is vulnerable to improper encoding or escaping of output in its archive member listing functionality. When listing archive members via cpio -it, member names are printed directly to output without quoting or escaping. An attacker can craft a cpio archive containing member names with embedded newline characters or ANSI escape sequences, causing forged listing entries or terminal control sequence injection when the listing is displayed. This issue has been fixed in commit 2ff9600c9ef32e88759843cdbde74c8db5ae9b30
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:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GNU cpio 输出处理不当漏洞
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及之前版本存在输出处理不当漏洞，该漏洞源于归档成员列表功能对输出编码或转义不当，可能导致攻击者构造包含换行符或ANSI转义序列的cpio归档，造成伪造列表条目或终端控制序列注入。
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-2026-66486

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III. Intelligence Information for CVE-2026-66486

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Patches & Fixes for CVE-2026-66486 (1)

Security Blog Posts for CVE-2026-66486 (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-2026-66485 4.6 MEDIUM Uncontrolled Memory Allocation in GNU cpio

IV. Related Vulnerabilities

Same product: cpio
Same vendor: GNU
Same weakness: CWE-116

V. Comments for CVE-2026-66486

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