---
id: CVE-2026-5747
title: >-
  An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0
  through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user
  with root privileges to crash the Firecracker VMM process or potentially
  execut…
summary: >-
  An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0
  through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user
  with root privileges to crash the Firecracker VMM process or potentially
  execut…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-369
  - CWE-787
vendor: amazon
product: firecracker
affected:
  - 'firecracker >= 1.13.0, <= 1.14.3'
  - firecracker = 1.15.0
published: '2026-04-08'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5747'
references:
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-015-aws/'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: >-
      https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
tags:
  - nvd
epss: 0.00208
epssPercentile: 0.112
ingestedAt: '2026-07-24T12:26:24.652Z'
---

## Overview

An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations.

To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.

## Affected

- `firecracker >= 1.13.0, <= 1.14.3`
- `firecracker = 1.15.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.