Path Traversal in Webp-Sh Webp Server Go
CVE-2026-53779
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Webp-Sh Webp Server Go — versions 0
Weakness classification (CWE)
References
- Pull Request (issue-tracking)
- Patch Commit (patch)
- www.vulncheck.com/advisories/webp-server-go-path-traversal-via-backslash-encodi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53779?
- CVE-2026-53779 is a high-severity vulnerability in Webp-Sh Webp Server Go, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-22.
- How severe is CVE-2026-53779?
- High severity. CVSS v3 base score is 7.5 out of 10.