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

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Summary

CVECVE-2026-62947
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 19:18:38 UTC
Updated2026-07-15 20:54:43 UTC
DescriptionOpenWrt 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.

Risk And Classification

Primary CVSS: v3.1 4.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openwrt Openwrt affected < 25.12.5 Not specified

References

ReferenceSourceLinkTags
github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 [email protected] github.com
github.com/openwrt/cgi-io/pull/4 [email protected] github.com
github.com/openwrt/openwrt/releases/tag/v25.12.5 [email protected] github.com
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