{"id":"CVE-2026-106073","title":"nodejs: Node.js: Filesystem read permission bypass via fs.realpathSync() (CVE-2026-106073)","summary":"A flaw was found in the Node.js Permission Model. fs.realpathSync() does not perform the filesystem read permission checks required of comparable fs APIs. This is an incomplete fix of CVE-2026-21715, which only covered fs.realpathSync.nati…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"vendor","cwe":["CWE-425","CWE-284"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9"],"published":"2026-10-23","updated":"2026-10-26","sourceUpdated":"2026-10-26T11:05:40+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106073"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2560021"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106073"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106073"},{"url":"https://nodejs.org/en/blog/vulnerability/october-2026-security-releases"}],"tags":["csaf","vex","red-hat","exploit-available","cve.org"],"epss":0.00245,"epssPercentile":0.15651,"exploits":{"github":1,"githubRepos":["https://github.com/CompleTetech-Security/node-cve-2026-106073-check"],"checkedAt":"2026-10-27T16:54:45.987Z"},"exploitAvailable":true,"ingestedAt":"2026-10-23T16:31:11.320Z","slug":"CVE-2026-106073","body":"## Overview\n\nA flaw was found in the Node.js Permission Model. fs.realpathSync() does not perform the filesystem read permission checks required of comparable fs APIs. This is an incomplete fix of CVE-2026-21715, which only covered fs.realpathSync.native(). Code running under --permission with restricted --allow-fs-read can still use fs.realpathSync() to probe file existence, resolve symlink targets, and enumerate paths outside permitted directories, leading to information disclosure.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json)\n\n**nodejs: Node.js: Filesystem read permission bypass via fs.realpathSync()** — rated Low by Red Hat. Released 2026-10-23, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNot affected:\n\n- Red Hat Hardened Images\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- If the Permission Model is unused, do not enable --permission.\nWhen --permission is required, avoid relying on fs.realpathSync() for security boundaries; use APIs that enforce permission checks and keep --allow-fs-read minimal (CME-1303: https://cmetaxonomy.org/entries/CME-1303.html).\nApply OS-level confinement (SELinux, containers) as defense in depth (CME-301: https://cmetaxonomy.org/entries/CME-301.html; CME-702: https://cmetaxonomy.org/entries/CME-702.html).","depth":"twilight","depthScore":30,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":229085,"id":"CVE-2026-106073","ts":1792902181306,"field":"exploit_available","old":"false","new":"true"}]}