High 7.5Published Apr 7, 2026

CVE-2026-5747Out-of-bounds Write in Firecracker virtio-pci Transport

Updated under an hour ago (Oct 26, 2026, 1:00 PM ET)

Does this affect you?

It affects AWS Firecracker and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for AWS Firecracker

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-787, CWE-369
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Analyzed
Record last updated: Apr 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS Firecracker aws:firecracker (from the name)	from 1.13.0 through 1.14.3; 1.15.0; 1.14.4 not affected; 1.15.1 not affected	CNA record
amazon firecracker amazon:firecracker	from 1.13.0 through 1.14.3; 1.15.0; 1.15.0	NVD

References

References

https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1	patch, release-notes
https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4	patch, release-notes
https://aws.amazon.com/security/security-bulletins/2026-015-aws/	vendor-advisory
https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r	third-party-advisory, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.