What’s Vulnerable › Vulnerabilities

CVE-2026-118655: Echo: Static Middleware Double-Unescape Path 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-174

Description

Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.

Affected products

• labstack echo: from 5.0.0, < 5.2.0; before 4.15.3

References

• https://github.com/labstack/echo/commit/a9ede66a5a7196411131beb1ee801e75bbaf7ac6
• https://github.com/labstack/echo/commit/c3fa2a27ff92b2b8db360de614f999ef1da24725
• https://github.com/labstack/echo/issues/2599
• https://github.com/labstack/echo/pull/3006
• https://github.com/labstack/echo/releases/tag/v4.15.3
• https://github.com/labstack/echo/releases/tag/v5.2.0
• https://github.com/labstack/echo/security/advisories/GHSA-xwq5-6cqp-vx96

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