{"cve":"CVE-2026-100839","nvd":{"published":"2026-09-27T02:17:22.230","modified":"2026-10-08T16:16:59.803","status":"Deferred","description":"Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.18.0, the guest kernel's ACPI/AML handling is vulnerable to an AML injection attack (\"BadAML\"). ACPI tables containing AML bytecode are passed from the untrusted host (QEMU) to the guest firmware (OVMF) and on to the Linux kernel, whose AML interpreter executes them. An attacker controlling the host — an assumed adversary in Contrast's threat model — can craft a table with malicious, Turing-complete AML bytecode that the guest kernel interprets with access to the full guest memory, including private pages, resulting in arbitrary code execution and disclosure or modification of confidential guest data. The issue affects the AMD SEV-SNP platforms Metal-QEMU-SNP and Metal-QEMU-SNP-GPU; Metal-QEMU-TDX is not affected because ACPI table contents are measured into RTMR 0 by OVMF on Intel TDX. Version v1.18.0 mitigates the attack by sandboxing the kernel AML interpreter so that it cannot read or write private memory pages. This weakness is not specific to Contrast but is generic to Confidential Computing setups that expose the ACPI interface to the host.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.4},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","score":8.4},"cwes":["CWE-94"],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-g9ww-x58f-9g6m","https://www.vulncheck.com/advisories/contrast-before-1.18.0-aml-injection-remote-code-execution"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-100839","score":0.00149,"percentile":0.04013,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-g9ww-x58f-9g6m","url":"https://osv.dev/vulnerability/GHSA-g9ww-x58f-9g6m","summary":"Contrast BadAML injection allows arbitrary code execution","modified":"2026-09-27T11:55:30.560728584Z","packages":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","ranges":["<1.18.0"],"fixed":["1.18.0"]}]},{"id":"GO-2026-4863","url":"https://osv.dev/vulnerability/GO-2026-4863","summary":"Contrast BadAML injection allows arbitrary code execution in github.com/edgelesssys/contrast","modified":"2026-09-27T11:55:30.560728584Z","packages":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","ranges":["<1.18.0"],"fixed":["1.18.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}