CVE-2026-1386

Arbitrary Host File Overwrite via Symlink in Firecracker Jailer

CVSS 6 MEDIUMEPSS 0.2%CWE-61

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6EPSS 0.2%KEV nãoPoC —Patch referenciado

Lifecycle

23 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

AWS · Firecracker

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

https://aws.amazon.com/security/security-bulletins/2026-003-AWS/https://github.com/firecracker-microvm/firecracker/releases/tag/v1.13.2 https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.1 https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-36j2-f825-qvgc