UNIX Symbolic Link Vulnerability in Firecracker by AWS
CVE-2026-1386

6MEDIUM

Key Information:

Vendor

Aws

Status
Firecracker
Vendor
CVE Published:
23 January 2026

What is CVE-2026-1386?

A local host user with write access to pre-created jailer directories in Firecracker can exploit a symbolic link following issue. When the jailer component is executed with root privileges, this vulnerability permits overwriting of arbitrary host files during the initialization process at jailer startup. The affected Firecracker versions are v1.13.1 and earlier and v1.14.0. Users are advised to upgrade to versions v1.13.2 or v1.14.1 and above to mitigate this risk.

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Affected Version(s)

Firecracker 1.13.2

Firecracker 1.14.1

References

https://aws.amazon.com/security/security-bulletins/2026-0...
vendor-advisory
https://github.com/firecracker-microvm/firecracker/releas...
patch
https://github.com/firecracker-microvm/firecracker/releas...
patch

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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