CVE-2026-55677
High
Description
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductGithub.com/labstack/echo/v5
PublishedJun 26, 2026
First seenJun 26, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- github.com/labstack/echo/v55.2.0 or later
- github.com/labstack/echo/v44.15.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/labstack/echo/v5Go | v < 5.2.0 | 5.2.0 |
| github.com/labstack/echo/v4Go | v < 4.15.3 | 4.15.3 |
| github.com/labstack/echoGo | v ≤ 3.3.10 | — |
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