{"id":"CVE-2026-24708","aliases":["PYSEC-2026-2685"],"url":"https://o3.security/vulnerability/CVE-2026-24708","summary":"OpenStack Nova calls qemu-img without format restrictions for resize ","details":"An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral disk and then triggering a resize, a user may convince Nova's Flat image backend to call qemu-img without a format restriction, resulting in an unsafe image resize operation that could destroy data on the host system. Only compute nodes using the Flat image backend (usually configured with use_cow_images=False) are affected.","published":"2026-02-18T18:30:40Z","modified":"2026-07-13T16:43:30.495970967Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H"},"epss":{"score":0.00341,"percentile":0.27045,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"nova","fixedVersion":null},{"ecosystem":"PyPI","name":"nova","fixedVersion":null},{"ecosystem":"PyPI","name":"nova","fixedVersion":null}],"fix":{"url":"https://github.com/openstack/nova/commit/3eba22ff09c81a61750fbb4882e5f1f01a20fdf5","label":"openstack/nova@3eba22f"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24708"},{"type":"WEB","url":"https://github.com/openstack/nova/commit/3eba22ff09c81a61750fbb4882e5f1f01a20fdf5"},{"type":"WEB","url":"https://bugs.launchpad.net/nova/+bug/2137507"},{"type":"PACKAGE","url":"https://github.com/openstack/nova"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2026/02/msg00025.html"},{"type":"WEB","url":"https://www.openwall.com/lists/oss-security/2026/02/17/7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-13T16:43:30.495970967Z"}}