CVE-2026-1386mediumCWE-61

Arbitrary Host File Overwrite via Symlink in Firecracker Jailer

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6epss 0.2%

exploitation probability

0.2%top 91% of all CVEs

observed exploitation

nono source reports it

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

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