CVE-2026-1386: Arbitrary Host File Overwrite via Symlink in Firecracker Jailer
A UNIX symbolic link following issue in the jailer component in Firecracker version v1.13.1 and earlier and 1.14.0 on Linux may allow a local host user with write access to the pre-created jailer directories to overwrite arbitrary host files via a symlink attack during the initialization copy at jailer startup, if the jailer is executed with root privileges.
To mitigate this issue, users should upgrade to version v1.13.2 or 1.14.1 or above.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-1386?
CVE-2026-1386 has a high severity due to the potential for arbitrary host file overwrite.
How do I fix CVE-2026-1386?
To fix CVE-2026-1386, upgrade Firecracker to version v1.13.2 or later, or v1.14.1 or later.
Who is affected by CVE-2026-1386?
CVE-2026-1386 affects local users with write access to the pre-created jailer directories on vulnerable Firecracker versions.
What versions of Firecracker are impacted by CVE-2026-1386?
Firecracker versions v1.13.1 and earlier, as well as version 1.14.0, are impacted by CVE-2026-1386.
What is the nature of the vulnerability described in CVE-2026-1386?
CVE-2026-1386 is a symbolic link following issue that can lead to arbitrary host file overwrites.