{"id":"CVE-2026-44593","aliases":["GHSA-3636-h3vx-6465","GO-2026-5071"],"url":"https://o3.security/vulnerability/CVE-2026-44593","summary":"esm.sh: Legacy Route Path Traversal Can Lead to RCE","details":"esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.","published":"2026-05-28T14:44:20.782Z","modified":"2026-08-07T11:31:09.481344454Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/esm-dev/esm.sh","fixedVersion":"0.0.0-20260508100112-1960055e1d53"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44593.json"},{"type":"ADVISORY","url":"https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44593"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:09.481344454Z"}}