{"id":"UBUNTU-CVE-2026-111133","details":"libfsapfs through 20260921 contains an integer underflow in libfsapfs_key_encrypted_key_read_data() that allows attackers to trigger heap out-of-bounds reads via crafted KEK attributes. Attackers can supply a crafted encrypted APFS image with malformed HMAC or wrapped KEK attribute lengths to crash fsapfsinfo, pyfsapfs, dfVFS or plaso and read adjacent heap memory before password checks.","modified":"2026-10-17T12:59:52.892170968Z","published":"2026-10-16T00:00:00Z","upstream":["CVE-2026-111133"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-111133"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-111133"},{"type":"REPORT","url":"https://github.com/libyal/libfsapfs"},{"type":"REPORT","url":"https://github.com/libyal/libfsapfs/blob/4c7c1c21f3cfc7d35f0b34b8a47f1f1562d27bbb/libfsapfs/libfsapfs_key_encrypted_key.c#L321-L333"},{"type":"REPORT","url":"https://github.com/libyal/libfsapfs/blob/4c7c1c21f3cfc7d35f0b34b8a47f1f1562d27bbb/libfsapfs/libfsapfs_key_encrypted_key.c#L528-L540"},{"type":"REPORT","url":"https://hackmd.io/@haind-pwn/libfsapfs-key-encrypted-key-attribute-oob-read"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libfsapfs-through-20260921-heap-out-of-bounds-read-via-libfsapfs-key-encrypted-key-read-data"}],"affected":[{"package":{"name":"libfsapfs","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libfsapfs?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20190210-1","20190210-1build1","20190210-1ubuntu1","20190210-1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"20190210-1.1","binary_name":"libfsapfs-utils"},{"binary_name":"libfsapfs1","binary_version":"20190210-1.1"},{"binary_name":"python3-fsapfs","binary_version":"20190210-1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111133.json"}},{"package":{"name":"libfsapfs","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libfsapfs?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20201107-1","20201107-1build1","20201107-1build2"],"ecosystem_specific":{"binaries":[{"binary_version":"20201107-1build2","binary_name":"libfsapfs-utils"},{"binary_name":"libfsapfs1","binary_version":"20201107-1build2"},{"binary_name":"python3-fsapfs","binary_version":"20201107-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111133.json"}},{"package":{"name":"libfsapfs","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libfsapfs?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20201107-1build3","20201107-1build4","20201107-1.1","20201107-1.1build1","20201107-1.1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"libfsapfs-utils","binary_version":"20201107-1.1build2"},{"binary_name":"libfsapfs1t64","binary_version":"20201107-1.1build2"},{"binary_version":"20201107-1.1build2","binary_name":"python3-fsapfs"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111133.json"}},{"package":{"name":"libfsapfs","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libfsapfs?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20240429-2ubuntu1","20240429-2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libfsapfs-utils","binary_version":"20240429-2ubuntu2"},{"binary_version":"20240429-2ubuntu2","binary_name":"libfsapfs1t64"},{"binary_name":"python3-fsapfs","binary_version":"20240429-2ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111133.json"}},{"package":{"name":"libfsapfs","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libfsapfs?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20240429-1ubuntu1","20240429-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libfsapfs-utils","binary_version":"20240429-2ubuntu1"},{"binary_version":"20240429-2ubuntu1","binary_name":"libfsapfs1t64"},{"binary_name":"python3-fsapfs","binary_version":"20240429-2ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111133.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}