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

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq Vendor AdvisoryExploit
• https://github.com/openwrt/cgi-io/pull/4 Issue TrackingPatch
• https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 Patch
• https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Release Notes