{"id":"CVE-2026-54319","aliases":["GHSA-fjv8-j4p5-cr9m","GO-2026-5367"],"url":"https://o3.security/vulnerability/CVE-2026-54319","summary":"Daytona: Path traversal in sandbox volume id mounts arbitrary host paths into the sandbox — cross-tenant data access and host escape","details":"## Summary\nA sandbox volume reference (`volumeId`, which may also be a volume name) was forwarded to the\nrunner and used to build the host bind-mount source path without confinement. A reference\ncontaining path-traversal sequences could in principle resolve the mount source outside the\nintended per-volume base directory.\n\n## Impact\nHad the traversal been reachable, an authenticated user could have caused the runner to\nbind-mount an unintended host path into their sandbox, with a worst-case impact of read and\nwrite access to other tenants' volume data (per-volume FUSE mounts are world-readable and\nwritable).\n\nImportant: this path was not exploitable in any released version. A volume reference is\nvalidated against the database before it reaches the runner, and the volume id column is a\nUUID type, so a reference containing traversal sequences is rejected at validation time and\nthe request fails before any mount is constructed. We could not reproduce cross-tenant access\nor an out-of-base host mount on a released build; the observable effect of the documented\npayload was a server-side validation error. Severity is assessed as Medium on that basis.\n\n## Patches\nFixed in v0.186.0. Volume references are now resolved to the canonical volume UUID\nserver-side before reaching the runner, so a name can never flow downstream as a path\ncomponent, and the runner confines the mount source to the volume base directory and rejects\nany non-UUID reference.\n\n## Workarounds\nUpgrade to v0.186.0 or later. No configuration workaround is required for released versions,\nwhich were not exploitable.\n\n## Credit\nReported by @vnth4nhnt from CyStack.","published":"2026-06-23T18:08:54.734Z","modified":"2026-10-21T02:58:33.301536261Z","cvss":{"score":4.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00243,"percentile":0.15705,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/daytonaio/daytona","fixedVersion":"0.186.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54319.json"},{"type":"ADVISORY","url":"https://github.com/daytonaio/daytona/security/advisories/GHSA-fjv8-j4p5-cr9m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54319"},{"type":"PACKAGE","url":"https://github.com/daytonaio/daytona"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:58:33.301536261Z"}}