CVE-2026-53779
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
WebP Server Go through version 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.
Risk Assessment
The risk is that an unauthenticated attacker can read sensitive system or configuration files, potentially leading to data leakage, privilege escalation, or further attacks on the infrastructure.
Recommendation
Immediately upgrade WebP Server Go to a version newer than 0.14.4 that includes a fix for this vulnerability. Until the update is applied, restrict access to the server to trusted networks only and implement additional path validation at the reverse proxy level.
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Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS