# Echo's middleware.Static: \`%2F\`-encoded path bypasses route/group middleware guarding a statically-served path Advisory record · `GHSA-375p-5qhx-8wq4` - **Identifiers:** `GHSA-375p-5qhx-8wq4` · `CVE-2026-118650` · `GO-2026-6873` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Weakness (CWE):** [CWE-177](https://cwe.mitre.org/data/definitions/177.html) · [CWE-863](https://cwe.mitre.org/data/definitions/863.html) - **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [CWE-177](https://agentprime.io/advisories/tag/cwe-177.md) - **Published:** 28 Oct 2026 - **Updated:** 5 Nov 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 28 Oct 2026, 19:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `github.com/labstack/echo/v5` (Go): affected `<5.4.0`; fixed in `5.4.0` - `github.com/labstack/echo/v4` (Go): affected `<4.16.0`; fixed in `4.16.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Echo v5 before 5.4.0 and Echo v4 before 4.16.0 are affected when middleware.Static is mounted globally. An unauthenticated remote user can fetch files in the static root by encoding a slash in the path, skipping route or group guards. Upgrade to Echo v5 5.4.0 or Echo v4 4.16.0; otherwise, keep protected files outside the static root. Written 1 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0040, the 34th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 28 Oct 2026, 19:25 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-118650) - 28 Oct 2026, 20:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-118650) - 31 Oct 2026, 14:11 UTC: First seen by agentprime - 31 Oct 2026, 14:11 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-375p-5qhx-8wq4) ## Sources - [GitHub Advisory Database: GHSA-375p-5qhx-8wq4](https://github.com/advisories/GHSA-375p-5qhx-8wq4) - [OSV: GHSA-375p-5qhx-8wq4](https://osv.dev/vulnerability/GHSA-375p-5qhx-8wq4) - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .