CVE-2026-118650

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CVE-2026-118650

Summary: Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served path

Details: Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, a globally mounted middleware.Static instance can interpret an encoded request path differently from Echo's router because the router matches the still-encoded path while the static handler uses the decoded URL.Path. The advisory demonstrates an encoded slash resolving to a file under the static root through the global static middleware, but the source is internally inconsistent about whether a route or group guard protects the corresponding literal path in that global-mount configuration. This issue is fixed in 4.16.0 and 5.4.0.

References: https://github.com/labstack/echo/releases/tag/v4.16.0, https://github.com/labstack/echo/releases/tag/v5.4.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118650.json, https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4, https://nvd.nist.gov/vuln/detail/CVE-2026-118650, https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1, https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af