{"id":"AZL-91590","summary":"CVE-2026-41579 affecting package runc for versions less than 1.3.6-1","details":"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.","modified":"2026-08-28T17:48:06.113011941Z","published":"2026-07-01T02:17:00Z","upstream":["CVE-2026-41579"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41579"}],"affected":[{"package":{"name":"runc","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/runc"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.6-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-91590.json"}}],"schema_version":"1.9.0"}