PT-2026-51372 · Webp Sh · Webp Server Go

Katriel Moses · Published 2026-06-22 · Updated 2026-06-22 · CVE-2026-53779

Mitre

CVSS v3.1

7.5

High

Base vector

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

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.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-53779

Affected Products

Webp Server Go

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-53779 · Security Note
• https://github.com/webp-sh/webp_server_go/commit/eb3b5f9289b331cb639cd610b0d1c532d2cc24e0 · Patch
• https://vulncheck.com/advisories/webp-server-go-path-traversal-via-backslash-encoding-on-windows · Note
• https://github.com/webp-sh/webp_server_go/pull/451 · Note