{"id":"CVE-2026-13723","summary":"Develar's electron-builder allows arbitrary file overwrite","details":"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.","modified":"2026-08-01T03:33:10.792305499Z","published":"2026-07-29T17:25:22.185Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13723.json","cna_assigner":"certcc"},"references":[{"type":"WEB","url":"http://kb.cert.org/vuls/id/293714"},{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/293714"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13723.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13723"},{"type":"FIX","url":"https://github.com/develar/app-builder/pull/163"},{"type":"PACKAGE","url":"https://github.com/develar/app-builder"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/develar/app-builder","events":[{"introduced":"0"},{"last_affected":"0bc38fb5e76c38ab24e36acf7a17887370e31fb4"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"4.2.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v4.2.0","v3.4.2","v3.4.0","v3.3.0","pkg/v3.3.0","v3.0.2","v2.6.18","v2.6.17","v2.6.14","v2.6.13","v2.6.0","v2.0.0","v1.11.5","v1.11.2","v1.11.0","v1.10.3","v1.9.6","v1.9.2","v1.9.0","v1.8.7","v0.6.1","v0.6.0","v0.5.0","v0.4.0","v0.3.1","v0.3.0","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-13723.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}