{"id":"CVE-2026-48716","summary":"nanobot: Path traversal via unsanitized WhatsApp document fileName enables arbitrary file write","details":"nanobot is a personal AI assistant. In versions 0.1.5.post3 and prior, the WhatsApp bridge in bridge/src/whatsapp.ts constructs a filesystem path using the fileName field from an incoming WhatsApp document message without sanitization. The WhatsApp bridge downloads media attachments and writes them to disk using a filename derived from the sender's message via documentMessage.fileName, which is concatenated with a prefix and its raw value is passed directly to path.join(mediaDir, outFilename). Node.js path.join resolves .. components, allowing an attacker to escape the intended media/ directory by sending a document with a crafted fileName such as ../../../.ssh/authorized_keys. Because the attacker also controls the file content (the downloaded buffer), this is a write-anywhere primitive — both path and content are attacker-controlled. A fix for this issue is planned for version 0.1.5.post4.","aliases":["GHSA-3f63-vcp3-hvqr"],"modified":"2026-08-07T11:31:22.683343186Z","published":"2026-06-18T18:46:28.599Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48716.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48716.json"},{"type":"ADVISORY","url":"https://github.com/HKUDS/nanobot/security/advisories/GHSA-3f63-vcp3-hvqr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48716"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hkuds/nanobot","events":[{"introduced":"0"},{"last_affected":"0b1631f33d8040802aa09d66a01bc731e3cb85a2"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"0.1.5.post3"}]}}],"versions":["v0.1.5.post3","v0.1.5.post2","v0.1.5.post1","v0.1.5","v0.1.4.post6","v0.1.4.post4","v0.1.4.post3","v0.1.4.post2","v0.1.4.post1","v0.1.4","v0.1.3.post6","v0.1.3.post5","v0.1.3.post4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48716.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H"}]}