{"id":"CVE-2026-5747","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-5747","generatedAt":"2026-10-27T23:58:44.376Z","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 execute arbitrary code…","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.\n\nTo remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.","published":"2026-04-08T00:16:06.000Z","lastModified":"2026-07-24T09:10:00.000Z","status":"Analyzed","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"CVSS:4.0/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/M"},"cwe":["CWE-369","CWE-787"],"affected":["amazon/firecracker"],"epss":{"score":0.00256,"percentile":0.17146,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-015-aws/","tags":["Vendor Advisory"],"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4","tags":["Release Notes"],"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1","tags":["Release Notes"],"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r","tags":["Vendor Advisory"],"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5747","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}