CVE-2026-62947: openwrt Path Traversal

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.

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CVSS v3.1 Score

4.9

MEDIUM

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

EPSS — Exploit Prediction

0.0036

Probability of exploitation

0.28%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
openwrt	openwrt	< 25.12.5

References

Advisories & Patches

https://github.com/openwrt/cgi-io/commit/72990b7489872112df31c94032637c907760bae4 https://github.com/openwrt/cgi-io/pull/4 https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq

Exploits

https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq https://github.com/openwrt/openwrt/security/advisories/GHSA-jw5r-xhf5-2xcq

Other References

https://github.com/openwrt/openwrt/releases/tag/v25.12.5

Frequently Asked Questions

What is CVE-2026-62947? +

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. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2026-62947? +

CVE-2026-62947 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0036, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-62947? +

CVE-2026-62947 affects products from openwrt, specifically: openwrt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-62947? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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