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CVE-2026-1386— Arbitrary Host File Overwrite via Symlink in Firecracker Jailer

Quick assessment

Affected
AWS Firecracker
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

firecracker是firecracker-microvm开源的一个用于无服务器计算的微型虚拟机。 firecracker v1.13.1及之前版本和1.14.0版本存在安全漏洞，该漏洞源于jailer组件存在UNIX符号链接跟随问题，可能导致本地主机用户覆盖任意主机文件。

CVSS 6.0 · Medium EPSS 0.22% · P11
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I. Basic Information for CVE-2026-1386

Vulnerability Information
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Vulnerability Title
Arbitrary Host File Overwrite via Symlink in Firecracker Jailer
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
firecracker 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
firecracker是firecracker-microvm开源的一个用于无服务器计算的微型虚拟机。 firecracker v1.13.1及之前版本和1.14.0版本存在安全漏洞，该漏洞源于jailer组件存在UNIX符号链接跟随问题，可能导致本地主机用户覆盖任意主机文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS Firecracker - -

II. Public POCs for CVE-2026-1386

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III. Intelligence Information for CVE-2026-1386

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Vendor Advisories for CVE-2026-1386 (1)

IV. Related Vulnerabilities

Same product: Firecracker
Same vendor: AWS
Same weakness: CWE-61

V. Comments for CVE-2026-1386

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