CVE-2026-1386
Arbitrary Host File Overwrite via Symlink in Firecracker Jailer
- State
- Published
- Severity
- 6.0 Medium
- Published
- Jan 23, 2026
- Updated
- Jan 23, 2026
- Reserved
- Jan 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H | AMZN |
| 3.1 | 6.0 Medium | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H | AMZN |
Weaknesses
- CWE-61 UNIX Symbolic Link (Symlink) Following
Affected Products
| Product | Versions |
|---|---|
FirecrackerAWS |
|
References
- https://aws.amazon.com/security/security-bulletins/2026-003-AWS/vendor-advisory
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.1patch
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.13.2patch
- https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-36j2-f825-qvgcthird-party-advisory
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