{"id":"CVE-2026-13723","state":"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.","publishedAt":"2026-07-29T17:25:22.185Z","updatedAt":"2026-07-29T18:21:44.159Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","source":"CISA-ADP"},"assigner":"certcc","products":["Develar app-builder"],"affected":[{"vendor":"Develar","product":"app-builder","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.2.0","versionType":"custom"}]}],"references":["https://github.com/develar/app-builder","http://kb.cert.org/vuls/id/293714","https://github.com/develar/app-builder/pull/163","https://www.kb.cert.org/vuls/id/293714"],"weaknesses":["CWE-22","CWE-59"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/13xxx/CVE-2026-13723.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-13723","state":"PUBLISHED","datePublished":"2026-07-29T17:25:22.185Z","dateUpdated":"2026-07-29T18:21:44.159Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-06-29T14:24:39.792Z"},"containers":{"cna":{"title":"Develar's electron-builder allows arbitrary file overwrite","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Develar","product":"app-builder","versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.2.0","versionType":"custom"}]}],"references":[{"url":"https://github.com/develar/app-builder"},{"url":"http://kb.cert.org/vuls/id/293714"},{"url":"https://github.com/develar/app-builder/pull/163"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]},{"descriptions":[{"lang":"en","description":"CWE-59 Improper Link Resolution Before File Access ('Link Following')"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-07-29T17:25:22.185Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.43","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-13723"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://www.kb.cert.org/vuls/id/293714"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-29T18:20:56.270Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.5,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-29T18:21:31.256338Z","id":"CVE-2026-13723","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","type":"CWE","lang":"en","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]},{"descriptions":[{"cweId":"CWE-59","type":"CWE","lang":"en","description":"CWE-59 Improper Link Resolution Before File Access ('Link Following')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-29T18:21:44.159Z"}}]}}}