{"id":"GHSA-w47m-jpv2-qfw5","summary":"Duplicate Advisory: Knowns Sandbox Escape: Unauthenticated Header Injection Grants AI Agent Unrestricted Access to Host Filesystem","details":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-9h2q-r9fh-f98w. This link is maintained to preserve external references.\n\n### Original Description\nknowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.","modified":"2026-09-25T17:15:05.943219949Z","published":"2026-09-10T18:31:45Z","withdrawn":"2026-09-25T17:11:36Z","database_specific":{"cwe_ids":["CWE-73"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-09-25T17:11:36Z","nvd_published_at":"2026-09-10T16:18:12Z"},"references":[{"type":"WEB","url":"https://github.com/knowns-dev/knowns/security/advisories/GHSA-9h2q-r9fh-f98w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88899"},{"type":"WEB","url":"https://github.com/knowns-dev/knowns/commit/37db0561b37b48b8bd035a417d7f1da6258ae657"},{"type":"WEB","url":"https://github.com/knowns-dev/knowns/blob/v0.30.0/internal/server/server.go#L1283-L1296"},{"type":"WEB","url":"https://github.com/knowns-dev/knowns/releases/tag/v0.31.0"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/knowns-before-0.31.0-external-control-of-agent-working-directory-via-x-opencode-directory-header"}],"affected":[{"package":{"name":"knowns","ecosystem":"npm","purl":"pkg:npm/knowns"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c 0.31.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-w47m-jpv2-qfw5/GHSA-w47m-jpv2-qfw5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}