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TI-2026-01085 Aliases CVE-2026-1386

Arbitrary Host File Overwrite via Symlink in Firecracker Jailer

Priority LOW 26CWE-61Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00212 11th percentileScored 2026-11-07
Fix Fixed Firecracker (AWS): 1.13.2, 1.14.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSFirecracker—1.13.2, 1.14.1Patch availableCNA
  • Firecracker VendorAWS Affected — Fixed in 1.13.2, 1.14.1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:*before 1.13.2VulnerableAWS
cpe:2.3:a:amazon:firecracker:1.14.0:-:*:*:*:*:*:*1.14.0VulnerableAWS
cpe:2.3:a:amazon:firecracker:1.14.0:dev:*:*:*:*:*:*1.14.0 devVulnerableAWS
  • cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:* Versions before 1.13.2 Vulnerable ·AWS
  • cpe:2.3:a:amazon:firecracker:1.14.0:-:*:*:*:*:*:* Versions 1.14.0 Vulnerable ·AWS
  • cpe:2.3:a:amazon:firecracker:1.14.0:dev:*:*:*:*:*:* Versions 1.14.0 dev Vulnerable ·AWS

Remediation

  • Fix · CNA Firecracker (AWS) Fixed in 1.13.2, 1.14.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-1386

References

Patch 2

Advisory 2

  • TI-2019-13671 Firecracker vsock implementation buffer overflow in versions 0.18.0 and 0.19.0. CVSS 3.1CRITICAL 9.8
  • TI-2026-05038 Out-of-bounds Write in Firecracker virtio-pci Transport CVSS 4.0HIGH 8.7
  • TI-2020-16517 In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console… CVSS 3.1HIGH 7.5
  • TI-2020-12848 In Firecracker 0.20.x before 0.20.1 and 0.21.x before 0.21.2, the network stack can… CVSS 3.1MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences