{"id":"UBUNTU-CVE-2026-79591","details":"A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.","modified":"2026-09-17T13:30:14.574632492Z","published":"2026-09-10T21:17:00Z","upstream":["CVE-2026-79591"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-79591"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-79591"},{"type":"REPORT","url":"https://github.com/libxls/libxls/issues/161"},{"type":"REPORT","url":"https://github.com/libxls/libxls/pull/164/changes/902c8f9b13710c3a13b6232fb86626c5c729402c"}],"affected":[{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"r-cran-readxl","binary_version":"0.1.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.json"}},{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0-1build1","1.0.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0-2","binary_name":"r-cran-readxl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.json"}},{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.1-2","1.3.1-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"r-cran-readxl","binary_version":"1.3.1-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.json"}},{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.1-2build2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.1-2build2","binary_name":"r-cran-readxl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.json"}},{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"r-cran-readxl","binary_version":"1.4.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.json"}},{"package":{"name":"r-cran-readxl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/r-cran-readxl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"r-cran-readxl","binary_version":"1.4.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79591.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:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}