Vulnerability · Published Jan 23, 2026 · Assigned by AMZN
CVE-2026-1386Arbitrary Host File Overwrite via Symlink in Firecracker Jailer
Medium 6.0
In plain English
A medium-severity security flaw in Firecracker from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | Firecracker | see references |
Weakness: CWE-61 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
References
- https://aws.amazon.com/security/security-bulletins/2026-003-AWS/ vendor-advisory
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.1 patch
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.13.2 patch
- https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-36j2-f825-qvgc third-party-advisory