CVE-2026-5747
Out-of-bounds Write in Firecracker virtio-pci Transport
Description
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.
INFO
Published Date :
April 8, 2026, 12:16 a.m.
Last Modified :
April 20, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
ff89ba41-3aa1-4d27-914a-91399e9639e5
Affected Products
The following products are affected by CVE-2026-5747
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | ff89ba41-3aa1-4d27-914a-91399e9639e5 | ||||
| CVSS 4.0 | HIGH | ff89ba41-3aa1-4d27-914a-91399e9639e5 | ||||
| CVSS 4.0 | HIGH | ff89ba41-3aa1-4d27-914a-91399e9639e5 |
Solution
- Upgrade Firecracker to version 1.14.4 or 1.15.1.
- Apply security patches for affected versions.
- Ensure virtio queue configuration is secure.
- Review host code execution preconditions.
Public PoC/Exploit Available at Github
CVE-2026-5747 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5747.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5747 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5747
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Tracking Vulnerabilities That Appear to be Credited to the Anthropic Research Team
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5747 vulnerability anywhere in the article.
-
Daily CyberSecurity
High-Severity Patches: NVIDIA Secures DALI and Triton Inference Server
NVIDIA has released two significant security updates addressing high-severity vulnerabilities across its DALI and Triton Inference Server software. The patches fix critical flaws that could lead to ar ... Read more
-
Daily CyberSecurity
Firecracker Security Alert: Virtio-PCI Vulnerability Could Lead to Out-of-Bounds Memory Access
AWS has issued a high-severity security advisory for Firecracker, the open-source virtualization technology purpose-built for high-scale, multi-tenant services like AWS Lambda and Fargate. The vulnera ... Read more
-
Daily CyberSecurity
CVE-2026-34208 (CVSS 10): Critical Sandbox Escape Uncovered in SandboxJS
In the world of secure software development, sandboxing is the ultimate safety net—a controlled environment designed to run untrusted code without letting it touch the “real” system. However, a critic ... Read more
The following table lists the changes that have been made to the
CVE-2026-5747 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by ff89ba41-3aa1-4d27-914a-91399e9639e5
Apr. 20, 2026
Action Type Old Value New Value Changed Description An out-of-bounds write issue in the virtio PCI transport in Amazon 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. 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. -
New CVE Received by ff89ba41-3aa1-4d27-914a-91399e9639e5
Apr. 08, 2026
Action Type Old Value New Value Added Description An out-of-bounds write issue in the virtio PCI transport in Amazon 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. Added CVSS V4.0 AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-787 Added CWE CWE-369 Added Reference https://aws.amazon.com/security/security-bulletins/2026-015-aws/ Added Reference https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4 Added Reference https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1 Added Reference https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r