{"id":"CVE-2026-53779","summary":"WebP Server Go \u003c 0.15.0 Path Traversal via Backslash Encoding on Windows","details":"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.","modified":"2026-08-07T11:31:10.119740475Z","published":"2026-06-22T18:22:40.698Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53779.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53779.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53779"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/webp-server-go-path-traversal-via-backslash-encoding-on-windows"},{"type":"REPORT","url":"https://github.com/webp-sh/webp_server_go/pull/451"},{"type":"FIX","url":"https://github.com/webp-sh/webp_server_go/commit/eb3b5f9289b331cb639cd610b0d1c532d2cc24e0"},{"type":"PACKAGE","url":"https://github.com/webp-sh/webp_server_go"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/webp-sh/webp_server_go","events":[{"introduced":"0"},{"fixed":"e02bf451b3a5d0362531f1bd620778b380053565"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"0.15.0"}]}}],"versions":["0.14.4","0.14.3","0.14.2","0.14.1","0.14.0","0.13.7","0.13.6","0.13.5","0.13.4","0.13.3","0.13.1","0.13.0","0.12.3","0.12.2","0.12.1","0.12.0","0.11.3","0.11.2","0.11.1","0.11.0","0.10.8","0.10.7","0.10.6","0.10.5","0.10.4","0.10.3","0.10.2","0.10.1","0.9.12","0.9.11","0.9.10","0.9.9","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.8.4","0.8.3","0.8.2","0.8.1","0.8.0","0.7.0","0.6.0","0.5.1","0.5.0","0.4.9","0.4.8","0.4.7","0.4.6","0.4.5","0.4.4","0.4.3","0.4.2","0.4.1","0.4.0","0.3.2","0.3.1","0.3.0","0.2.2","0.2.1","0.2.0","0.1.5","0.1.4","0.1.3","0.1.2","0.1.1","0.1.0","0.0.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53779.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"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"}]}