CVE-2026-118658
Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto
Echo is a Go web framework. Prior to 4.15.2 and 5.1.1, Context.Scheme returns values from X-Forwarded-Proto, X-Forwarded-Protocol, or X-Url-Scheme without validating that they are supported web schemes. WWWRedirect and NonWWWRedirect use that value to construct a Location header, so an attacker controlling a forwarded scheme header can cause a redirect to use an arbitrary URI scheme. Exploitation requires an affected redirect middleware and user interaction with the response; the HTTPS-specific redirect variants hardcode HTTPS and are unaffected. This issue is fixed in 4.15.2 and 5.1.1.
Fixes and workarounds
Fix
github.com/labstack/echo/v5 (Go): OSV reports a fixed version 5.1.1. Check the advisory for supported release branches.
Source: OSV GHSA-23wf-92cp-8pcjFix
github.com/labstack/echo/v4 (Go): OSV reports a fixed version 4.15.2. Check the advisory for supported release branches.
Source: OSV GHSA-23wf-92cp-8pcjAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| echo labstack |
>= 5.0.0, < 5.1.1 (affected) < 4.15.2 (affected) |
CNA: GitHub_M |
github.com/labstack/echo/v5github.com/labstack/echo/v5
Go |
≥ 0; < 5.1.1 (affected, semver); OSV events: introduced 0; fixed 5.1.1Source events (semver)Other versions: unaffected |
OSV GHSA-23wf-92cp-8pcj |
github.com/labstack/echo/v4github.com/labstack/echo/v4
Go |
≥ 0; < 4.15.2 (affected, semver); OSV events: introduced 0; fixed 4.15.2Source events (semver)Other versions: unaffected |
OSV GHSA-23wf-92cp-8pcj |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 4.7 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcj
exploit · ADP: CISA-ADP
References
- https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcjCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515dfCNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v4.15.2CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v5.1.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcjADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-23wf-92cp-8pcjOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-23wf-92cp-8pcjOSV / GitHub Security Advisories · osv
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