{"id":"CVE-2026-23644","aliases":["GHSA-2657-3c98-63jq","GO-2026-4332"],"url":"https://o3.security/vulnerability/CVE-2026-23644","summary":"esm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packages","details":"esm.sh is a no-build content delivery network (CDN) for web development. Prior to Go pseeudoversion 0.0.0-20260116051925-c62ab83c589e, the software has a path traversal vulnerability due to an incomplete fix. `path.Clean` normalizes a path but does not prevent absolute paths in a malicious tar file. Commit https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16, corresponding to pseudoversion 0.0.0-20260116051925-c62ab83c589e, fixes this issue.","published":"2026-01-18T22:49:29.676Z","modified":"2026-08-07T11:50:30.338717228Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/esm-dev/esm.sh","fixedVersion":null},{"ecosystem":"Go","name":"github.com/esm-dev/esm.sh","fixedVersion":"0.0.0-20260116051925-c62ab83c589e"}],"fix":{"url":"https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16","label":"esm-dev/esm.sh@9d77b88"},"references":[{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2025-4138"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23644.json"},{"type":"ADVISORY","url":"https://github.com/esm-dev/esm.sh/security/advisories/GHSA-2657-3c98-63jq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23644"},{"type":"FIX","url":"https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16"},{"type":"FIX","url":"https://github.com/esm-dev/esm.sh/commit/c62ab83c589e7b421a0e1376d2a00a4e48161093"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:30.338717228Z"}}