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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (10.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
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.