# CVE-2026-118658: Echo web framework arbitrary URI scheme redirect

Source: https://junglewise.ai/threats/cve-2026-118658-echo-is-a-go-web-framework-prior-to-4-15-2-and-5-1-1-context  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-118658 · Severity: medium · CVSS 4.7 · Published 2026-10-28

Echo is a popular Go web framework used to build REST APIs and web applications. A flaw in how it processes redirect headers allows an attacker to craft a malicious redirect that points to any URI scheme (such as javascript: or data:), potentially leading to phishing or credential theft if a user clicks the redirect. The vulnerability requires an application to use Echo's redirect middleware and a user to click the attacker's crafted link.

Technologies: [github.com/labstack/echo/v4 (Go)](https://junglewise.ai/threats/technologies/github-com-labstack-echo-v4), [github.com/labstack/echo/v5 (Go)](https://junglewise.ai/threats/technologies/github-com-labstack-echo-v5), [Labstack Echo](https://junglewise.ai/threats/technologies/labstack-echo). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Labstack](https://junglewise.ai/threats/vendors/labstack).

## Quick answers

**Is CVE-2026-118658 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118658 being exploited in the wild.

**How severe is CVE-2026-118658?** Medium severity, with a CVSS score of 4.7, published 28 October 2026.

**Which products and versions are affected?** github.com/labstack/echo/v4 (Go) < 4.15.2, SEMVER:introduced=0,fixed=4.15.2; github.com/labstack/echo/v5 (Go) < 5.1.1, SEMVER:introduced=0,fixed=5.1.1; Labstack Echo before 4.15.2 and 5.0.x before 5.1.1.

**Is there a fix for CVE-2026-118658?** Yes. github.com/labstack/echo/v4 (Go): upgrade to 4.15.2 or later; github.com/labstack/echo/v5 (Go): upgrade to 5.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-118658 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-118658?** Check whether you run github.com/labstack/echo/v4 (Go), github.com/labstack/echo/v5 (Go) or Labstack Echo at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/labstack/echo/v4 (Go): upgrade to 4.15.2 or later

  ```sh
  go get github.com/labstack/echo/v4@v4.15.2
  ```

- github.com/labstack/echo/v5 (Go): upgrade to 5.1.1 or later

  ```sh
  go get github.com/labstack/echo/v5@v5.1.1
  ```


## Technical details

Echo's Context.Scheme method accepts values from the X-Forwarded-Proto, X-Forwarded-Protocol, and X-Url-Scheme headers without validation, allowing arbitrary URI schemes. The WWWRedirect and NonWWWRedirect middleware use this value to construct Location headers, enabling an attacker to inject non-standard schemes. This affects only the generic redirect variants; the HTTPS-specific variants are unaffected as they hardcode the scheme.

## Affected products

- labstack Echo before 4.15.2 and 5.0.x before 5.1.1

## Identifiers

- CVE-2026-118658
- GHSA-23wf-92cp-8pcj
- GO-2026-6878

## Timeline

- 2026-10-28: disclosed

## References

- [https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181](https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181)
- [https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df](https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df)

## Related threats

- [Echo Go web framework scheme header spoofing and HSTS bypass](https://junglewise.ai/threats/cve-2026-118657-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-context)
- [Echo open redirect in sanitizeURI with trailing slash redirect](https://junglewise.ai/threats/cve-2026-118656-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-sanitizeuri)
- [Echo path traversal via double URL encoding in Static middleware](https://junglewise.ai/threats/cve-2026-118655-echo-is-a-go-web-framework-prior-to-4-15-3-and-5-2-0-middleware)
- [Echo path traversal in static file handlers via dot segment normalization](https://junglewise.ai/threats/cve-2026-118654-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-echo-s)
- [Echo Go web framework rate-limit bypass via spoofed IP headers](https://junglewise.ai/threats/cve-2026-118653-echo-is-a-go-web-framework-from-4-0-0-until-5-1-0-context-realip)