Windows
CVE-2026-25766
MEDIUM
GHSA-pgvm-wxw2-hrv9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo’s middleware.Static using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In middleware/static.go, the requested path is unescaped and normalized with path.Clean (URL semantics). path.Clean does not treat \ as a path separator, so ..\ sequences remain in the cleaned path. The resulting path is then passed to currentFS.Open(...). When the filesystem is left at the default (nil), Echo uses defaultFS which calls os.Open (echo.go:792). On Windows, os.Open treats \ as a path separator and resolves ..\, allowing traversal outside the static root. Version 5.0.3 fixes the issue.
AnalysisAI
Unauthenticated remote file read in Echo web framework versions 5.0.0-5.0.2 on Windows allows attackers to traverse outside the static root directory and access arbitrary files via backslash path sequences in requests. The vulnerability stems from improper path normalization where path.Clean() does not treat backslashes as separators, but the underlying os.Open() call on Windows does, enabling directory traversal. Public exploit code exists for this medium-severity vulnerability, though a patch is available in version 5.0.3.
Technical ContextAI
Classified as CWE-22 (Path Traversal). Affects Echo. Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo’s middleware.Static using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In middleware/static.go, the requested path is unescaped and normalized with path.Clean (URL semantics). path.Clean does not treat \ as a path separator, so ..\ sequences remain in the cleaned path. The resulting path is then passed to `currentFS.Open(...)
RemediationAI
A vendor patch is available — apply it immediately. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
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External POC / Exploit Code
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