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CVE-2026-62947— OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download

Quick assessment

Affected
openwrt openwrt
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.

OpenWrt是OpenWRT社区开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 25.12.5之前版本存在路径遍历漏洞，该漏洞源于cgi-download处理器在规范化前未对请求路径进行适当授权，以及rpcd session.c使用fnmatch()时未使用FNM_PATHNAME参数，允许通过通配符前缀加../的方式进行路径遍历，导致可读取包括/etc/shadow在内的root可读文件。

CVSS 4.9 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1552.001 · Credentials In Files

Affected Version Matrix 1

VendorProduct Version RangeStatus
openwrt openwrt < 25.12.5 affected
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I. Basic Information for CVE-2026-62947

Vulnerability Information
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Vulnerability Title
OpenWrt: ACL bypass and arbitrary root file read via cgi-io cgi-download
Source: CVE Program / CVE List V5
Vulnerability Description
OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, the cgi-download handler in cgi-io authorizes the requested path against the caller's ubus session file ACL before canonicalization, and rpcd session.c uses fnmatch() without FNM_PATHNAME, allowing traversal such as an allowed wildcard prefix followed by ../ to read root-readable files including /etc/shadow. This vulnerability is fixed in 25.12.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/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
OpenWrt 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenWrt是OpenWRT社区开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 25.12.5之前版本存在路径遍历漏洞，该漏洞源于cgi-download处理器在规范化前未对请求路径进行适当授权，以及rpcd session.c使用fnmatch()时未使用FNM_PATHNAME参数，允许通过通配符前缀加../的方式进行路径遍历，导致可读取包括/etc/shadow在内的root可读文件。
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
openwrt openwrt < 25.12.5 -

II. Public POCs for CVE-2026-62947

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III. Intelligence Information for CVE-2026-62947

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Patches & Fixes for CVE-2026-62947 (2)

Vendor Advisories for CVE-2026-62947 (1)

Vendor Pages for CVE-2026-62947 (1)

IV. Related Vulnerabilities

Same product: openwrt
Same vendor: openwrt
Same weakness: CWE-22

V. Comments for CVE-2026-62947

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