{"id":"CVE-2026-13723","aliases":["EUVD-2026-50423","GHSA-m52r-27c6-4q88"],"status":"published","title":"Develar's electron-builder allows arbitrary file overwrite","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\r\n•\ta symlink entry named ss pointing to a target file, and\r\n•\ta regular file named ß containing attacker controlled data,\r\nwill cause the second write to follow the symlink and overwrite the target file.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.0048,"percentile":0.41745,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22","CWE-59"],"published":"2026-07-29T17:25:22Z","modified":"2026-10-28T02:30:44Z","products":[{"vendor":"develar","product":"app-builder"}],"references":[{"url":"https://github.com/develar/app-builder","tags":["package"]},{"url":"http://kb.cert.org/vuls/id/293714","tags":["web"]},{"url":"https://github.com/develar/app-builder/pull/163","tags":["fix"]},{"url":"https://www.kb.cert.org/vuls/id/293714","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13723","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-m52r-27c6-4q88"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13723.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-13723","title":"Develar's electron-builder allows arbitrary file overwrite","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\r\n•\ta symlink entry named ss pointing to a target file, and\r\n•\ta regular file named ß containing attacker controlled data,\r\nwill cause the second write to follow the symlink and overwrite the target file.","status":"published","published":"2026-07-29T17:25:22.185Z","modified":"2026-07-29T18:21:44.159Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"adp"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T14:19:49.885652Z"}],"euvd":[{"id":"EUVD-2026-50423","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\r\n•\ta symlink entry named ss pointing to a target file, and\r\n•\ta regular file named ß containing attacker controlled data,\r\nwill cause the second write to follow the symlink and overwrite the target file.","status":"published","published":"2026-07-29T17:25:22Z","modified":"2026-07-29T18:21:44Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T18:02:29.807737Z"}],"ghsa":[{"id":"GHSA-m52r-27c6-4q88","title":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an...","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\n•\ta symlink entry named ss pointing to a target file, and\n•\ta regular file named ß containing attacker controlled data,\nwill cause the second write to follow the symlink and overwrite the target file.","status":"published","published":"2026-07-29T18:31:40Z","modified":"2026-07-29T21:32:03Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:09:54.918351Z"}],"nvd":[{"id":"CVE-2026-13723","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\r\n•\ta symlink entry named ss pointing to a target file, and\r\n•\ta regular file named ß containing attacker controlled data,\r\nwill cause the second write to follow the symlink and overwrite the target file.","status":"published","published":"2026-07-29T18:16:50.603Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T14:12:33.629616Z"}],"osv":[{"id":"CVE-2026-13723","title":"Develar's electron-builder allows arbitrary file overwrite","description":"A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:\r\n•\ta symlink entry named ss pointing to a target file, and\r\n•\ta regular file named ß containing attacker controlled data,\r\nwill cause the second write to follow the symlink and overwrite the target file.","status":"published","published":"2026-07-29T17:25:22.185Z","modified":"2026-10-28T02:30:44.386621007Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:57.354194Z"}]}}