What’s Vulnerable › Vulnerabilities

CVE-2026-118654: Echo static file middleware route protection bypass via encoded dot-dot traversal

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-29
• Weakness: CWE-22

Description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's static file handlers can normalize dot segments after route matching and serve a file through a public static route even though the corresponding direct path is protected by route-level middleware. An unauthenticated attacker can read files that an application intended to protect with route-level middleware, when those files are also reachable through a static filesystem mount after path normalization. This vulnerability is the result of an incomplete fix for CVE-2026-55677. This issue is fixed in 4.16.0 and 5.4.0.

Affected products

• labstack echo: before 4.16.0; from 5.0.0, < 5.4.0

References

• https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1
• https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af
• https://github.com/labstack/echo/releases/tag/v4.16.0
• https://github.com/labstack/echo/releases/tag/v5.4.0
• https://github.com/labstack/echo/security/advisories/GHSA-3pmx-cf9f-34xr

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