Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118656
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 21:16:55 UTC
Updated2026-10-28 21:16:55 UTC
DescriptionEcho is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

Problem Types: CWE-601 | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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/security/advisories/GHSA-v753-g4cw-jm48 [email protected] github.com
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/releases/tag/v5.4.0 [email protected] github.com
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