Echo: Static Middleware Double-Unescape Path Traversal

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118655
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 20:17:22 UTC
Updated2026-10-28 20:17:22 UTC
DescriptionEcho 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-174 | CWE-174 CWE-174: Double Decoding of the Same Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Labstack Echo affected >= 5.0.0, < 5.2.0 Not specified
CNA Labstack Echo affected < 4.15.3 Not specified

References

ReferenceSourceLinkTags
github.com/labstack/echo/issues/2599 [email protected] github.com
github.com/labstack/echo/commit/c3fa2a27ff92b2b8db360de614f999ef1da24725 [email protected] github.com
github.com/labstack/echo/commit/a9ede66a5a7196411131beb1ee801e75bbaf7ac6 [email protected] github.com
github.com/labstack/echo/security/advisories/GHSA-xwq5-6cqp-vx96 [email protected] github.com
github.com/labstack/echo/releases/tag/v4.15.3 [email protected] github.com
github.com/labstack/echo/pull/3006 [email protected] github.com
github.com/labstack/echo/releases/tag/v5.2.0 [email protected] github.com
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