Vulnerability in Amazon Firecracker
CVE-2026-1386
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.
EPSS: 0.002 (9.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Amazon Firecracker — versions 1.14.0
- Aws Firecracker — versions 1.13.2, 1.14.1
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Product, Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Product, Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (Vendor Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-1386?
- CVE-2026-1386 is a medium-severity vulnerability in Amazon Firecracker, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 6.0/10. Published 2026-01-23.
- How severe is CVE-2026-1386?
- Medium severity. CVSS v3 base score is 6.0 out of 10.