{"id":"UBUNTU-CVE-2026-121542","details":"In Docker Buildx versions v0.19.0 through v0.38.0, an untrusted Bake definition may expose files accessible to the Buildx client without the expected fs.read approval. Under certain conditions, paths under the same parent directory as the current working directory whose names use the working directory's basename as a prefix can skip the filesystem entitlement check. Exploitation requires specific matching filenames next to the current project directory. Users who run untrusted Bake definitions may be affected. The issue is fixed in v0.38.1.","modified":"2026-11-05T11:45:27.907823385Z","published":"2026-11-03T22:19:00Z","upstream":["CVE-2026-121542"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-121542"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-121542"},{"type":"REPORT","url":"https://github.com/docker/buildx/security/advisories/GHSA-rghq-x9hf-hc3r"}],"affected":[{"package":{"name":"docker.io","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/docker.io?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2~dfsg1-1ubuntu4","1.10.2-0ubuntu3","1.10.2-0ubuntu4","1.10.3-0ubuntu1","1.10.3-0ubuntu4","1.10.3-0ubuntu5","1.10.3-0ubuntu6","1.11.2-0ubuntu5~16.04","1.12.1-0ubuntu13~16.04.1","1.12.3-0ubuntu4~16.04.2","1.12.6-0ubuntu1~16.04.1","1.13.1-0ubuntu1~16.04.2","17.03.2-0ubuntu2~16.04.1","18.06.1-0ubuntu1~16.04.2","18.06.1-0ubuntu1.2~16.04.1","18.09.2-0ubuntu1~16.04.1","18.09.5-0ubuntu1~16.04.2","18.09.7-0ubuntu1~16.04.1","18.09.7-0ubuntu1~16.04.4","18.09.7-0ubuntu1~16.04.5","18.09.7-0ubuntu1~16.04.6","18.09.7-0ubuntu1~16.04.7","18.09.7-0ubuntu1~16.04.9+esm1","18.09.7-0ubuntu1~16.04.9+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"docker.io","binary_version":"18.09.7-0ubuntu1~16.04.9+esm2"},{"binary_name":"golang-docker-dev","binary_version":"18.09.7-0ubuntu1~16.04.9+esm2"},{"binary_name":"golang-github-docker-docker-dev","binary_version":"18.09.7-0ubuntu1~16.04.9+esm2"},{"binary_name":"vim-syntax-docker","binary_version":"18.09.7-0ubuntu1~16.04.9+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121542.json"}},{"package":{"name":"docker.io","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.1-0ubuntu6","17.03.2-0ubuntu1","17.03.2-0ubuntu3","17.03.2-0ubuntu5","17.12.1-0ubuntu1","18.06.1-0ubuntu1~18.04.1","18.06.1-0ubuntu1.2~18.04.1","18.09.2-0ubuntu1~18.04.1","18.09.5-0ubuntu1~18.04.2","18.09.7-0ubuntu1~18.04.1","18.09.7-0ubuntu1~18.04.3","18.09.7-0ubuntu1~18.04.4","19.03.6-0ubuntu1~18.04.1","19.03.6-0ubuntu1~18.04.2","19.03.6-0ubuntu1~18.04.3","20.10.2-0ubuntu1~18.04.2","20.10.2-0ubuntu1~18.04.3","20.10.7-0ubuntu1~18.04.1","20.10.7-0ubuntu1~18.04.2","20.10.7-0ubuntu5~18.04.2","20.10.7-0ubuntu5~18.04.3","20.10.12-0ubuntu2~18.04.1","20.10.21-0ubuntu1~18.04.2","20.10.21-0ubuntu1~18.04.3","20.10.21-0ubuntu1~18.04.3+esm1","20.10.21-0ubuntu1~18.04.3+esm2","20.10.21-0ubuntu1~18.04.3+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"docker.io","binary_version":"20.10.21-0ubuntu1~18.04.3+esm3"},{"binary_name":"golang-docker-dev","binary_version":"20.10.21-0ubuntu1~18.04.3+esm3"},{"binary_version":"20.10.21-0ubuntu1~18.04.3+esm3","binary_name":"golang-github-docker-docker-dev"},{"binary_name":"vim-syntax-docker","binary_version":"20.10.21-0ubuntu1~18.04.3+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121542.json"}},{"package":{"name":"docker.io","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/docker.io?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["19.03.2-0ubuntu1","19.03.6-0ubuntu1","19.03.8-0ubuntu1","19.03.8-0ubuntu1.20.04","19.03.8-0ubuntu1.20.04.1","19.03.8-0ubuntu1.20.04.2","20.10.2-0ubuntu1~20.04.2","20.10.2-0ubuntu1~20.04.3","20.10.7-0ubuntu1~20.04.1","20.10.7-0ubuntu1~20.04.2","20.10.7-0ubuntu5~20.04.1","20.10.7-0ubuntu5~20.04.2","20.10.12-0ubuntu2~20.04.1","20.10.21-0ubuntu1~20.04.1","20.10.21-0ubuntu1~20.04.2","20.10.21-0ubuntu1~20.04.4","20.10.21-0ubuntu1~20.04.5","20.10.21-0ubuntu1~20.04.6","20.10.21-0ubuntu1~20.04.6+esm1","20.10.21-0ubuntu1~20.04.6+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"20.10.21-0ubuntu1~20.04.6+esm2","binary_name":"golang-docker-dev"},{"binary_version":"20.10.21-0ubuntu1~20.04.6+esm2","binary_name":"golang-github-docker-docker-dev"},{"binary_name":"vim-syntax-docker","binary_version":"20.10.21-0ubuntu1~20.04.6+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121542.json"}},{"package":{"name":"docker.io-app","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/docker.io-app?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.10.25-0ubuntu1~20.04.1","20.10.25-0ubuntu1~20.04.2","24.0.5-0ubuntu1~20.04.1","24.0.7-0ubuntu2~20.04.1","26.1.3-0ubuntu1~20.04.1","26.1.3-0ubuntu1~20.04.1+esm1","26.1.3-0ubuntu1~20.04.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"docker.io","binary_version":"26.1.3-0ubuntu1~20.04.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU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