CVE-2026-53779
WebP Server Go < 0.15.0 Path Traversal via Backslash Encoding on Windows
- State
- Published
- Severity
- 8.7 High
- Published
- Jun 22, 2026
- Updated
- Sep 24, 2026
- Reserved
- Jun 10, 2026
Description
WebP Server Go through 0.14.4 contains a path traversal vulnerability on Windows that allows unauthenticated attackers to read files outside the configured IMG_PATH directory by sending requests with percent-encoded backslashes (%5C) that bypass the path.Clean() sanitization in handler/router.go. Attackers can exploit the discrepancy between Go's forward-slash-only path normalization and Windows file system APIs that treat backslashes and forward slashes as equivalent to access arbitrary files on the host filesystem accessible to the server process.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
| Product | Versions |
|---|---|
webp_server_gowebp-sh |
|
References
- Pull Requestissue-tracking
- Patch Commitpatch
- https://www.vulncheck.com/advisories/webp-server-go-path-traversal-via-backslash-encoding-on-windowsthird-party-advisory
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