Threat Intelligence Database

Bulletin ID: 2026-015-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/07 15:30 PM PDT Description: Firecracker is an open source virtualization technology that is purpose-built for creating and managing secure, multi-tenant container and function-based services. We identified CVE-2026-5747, 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 that 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. No AWS service is affected. Impacted versions: Firecracker >= 1.13.0 AND <= 1.14.3 AND 1.15.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

Bulletin ID: 2026-003-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/01/23 12:30 PM PST Description: Firecracker is an open source virtualization technology that is purpose-built for creating and managing secure, multi-tenant container and function-based services. Firecracker runs in user space and uses the Linux Kernel-based Virtual Machine (KVM) to create microVMs. Each Firecracker microVM is further isolated with common Linux user-space security barriers by a companion program called "jailer". The jailer provides a second line of defense in case a user escapes from the microVM boundaries and it is released at each Firecracker version. We are aware of CVE-2026-1386, an issue that is related to the Firecracker jailer, which under certain circumstances can allow an user to overwrite arbitrary files in the host filesystem. AWS services that use Firecracker are not impacted by the issue as we appropriately restrict access to the host and the jailer folder, blocking the preconditions required for the attack to happen. Impacted versions: Firecracker version v1.13.1 and earlier and 1.14.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.