Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118650
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 20:17:21 UTC
Updated2026-10-28 20:17:21 UTC
DescriptionEcho is a Go web framework. Prior to 4.16.0 and 5.4.0, a globally mounted middleware.Static instance can interpret an encoded request path differently from Echo's router because the router matches the still-encoded path while the static handler uses the decoded URL.Path. The advisory demonstrates an encoded slash resolving to a file under the static root through the global static middleware, but the source is internally inconsistent about whether a route or group guard protects the corresponding literal path in that global-mount configuration. This issue is fixed in 4.16.0 and 5.4.0.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-177 | CWE-863 | CWE-177 CWE-177: Improper Handling of URL Encoding (Hex Encoding) | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Labstack Echo affected >= 5.0.0, < 5.4.0 Not specified
CNA Labstack Echo affected < 4.16.0 Not specified

References

ReferenceSourceLinkTags
github.com/labstack/echo/releases/tag/v4.16.0 [email protected] github.com
github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af [email protected] github.com
github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 [email protected] github.com
github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4 [email protected] github.com
github.com/labstack/echo/releases/tag/v5.4.0 [email protected] github.com
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