{"id":"CVE-2026-26824","aliases":["DEBIAN-CVE-2026-26824","EUVD-2026-34178","GHSA-hwmf-9wj8-35pw","JLSEC-2026-1301","UBUNTU-CVE-2026-26824","openSUSE-SU-2026:12110-1","openSUSE-SU-2026:22128-1"],"status":"published","title":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE...","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.0027,"percentile":0.19459,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-457"],"published":"2026-06-03T00:00:00Z","modified":"2026-10-28T10:51:22Z","fixes":[{"ecosystem":"Debian:14","package":"r-cran-readxl","fixed_in":["1.6.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.2-1","1.4.3-1","1.4.4-1","1.4.5-1","1.5.0-1","1.5.0.1-1","1.6.0-1"]},{"source":"osv","ecosystem":"Debian:13","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.5-1","1.5.0-1","1.5.0.1-1","1.6.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.0-1"}]}],"versions":["1.4.5-1","1.5.0-1","1.5.0.1-1"]},{"source":"osv","ecosystem":"Julia","package":"libxls_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0-1build1","1.0.0-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.1-2","1.3.1-2build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.1-2build2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.5-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.5-1","1.5.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"r-cran-readxl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.5-1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"libxls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.4-1.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"libxls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.4-bp160.1.1"}]}],"bundled":2}],"products":[{"vendor":"libxls_project","product":"libxls"}],"references":[{"url":"https://github.com/libxls/libxls/issues/155","tags":["exploit","Exploit","Issue Tracking","report","web"]},{"url":"https://github.com/libxls/libxls/commit/9adebc9b6d60db21f25ddc898e8760eeb69d6529","tags":["fix"]},{"url":"https://github.com/libxls/libxls/issues/153","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26824","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hwmf-9wj8-35pw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26824.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-26824","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-26824","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-26824","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-26824","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-26825","tags":["web"]},{"url":"https://bugzilla.suse.com/1267608","tags":["report"]},{"url":"https://bugzilla.suse.com/1267687","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-26824","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T00:00:00Z","modified":"2026-09-23T15:47:31.076Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium","assessor":"adp"}],"cwes":["CWE-457"],"updated_at":"2026-11-02T13:38:32.13011Z"}],"euvd":[{"id":"EUVD-2026-34178","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T00:00:00Z","modified":"2026-09-23T15:47:31Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T17:28:00.617613Z"}],"ghsa":[{"id":"GHSA-hwmf-9wj8-35pw","title":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE...","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T21:30:31Z","modified":"2026-09-23T18:31:09Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"cwes":["CWE-457"],"updated_at":"2026-11-02T15:12:20.494129Z"}],"nvd":[{"id":"CVE-2026-26824","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T20:16:18.677Z","modified":"2026-09-23T16:16:42.363Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-457"],"updated_at":"2026-11-02T14:12:22.022466Z"}],"osv":[{"id":"CVE-2026-26824","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T00:00:00Z","modified":"2026-10-28T10:51:22.271671262Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:59.80315Z"},{"id":"DEBIAN-CVE-2026-26824","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T20:16:18.677Z","modified":"2026-10-25T05:00:06.426807899Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"JLSEC-2026-1301","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in `read_MSAT()` is not fully initialized before being consumed by `ole2_validate_sector_chain()`, which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-08-13T10:57:26.913Z","modified":"2026-08-13T11:00:03.421298991Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"UBUNTU-CVE-2026-26824","description":"libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file","status":"published","published":"2026-06-03T20:16:00Z","modified":"2026-10-17T12:58:48.656013722Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:56:08.726452Z"},{"id":"openSUSE-SU-2026:12110-1","title":"libxls-devel-1.6.4-1.1 on GA media","description":"These are all security issues fixed in the libxls-devel-1.6.4-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-12T00:00:00Z","modified":"2026-10-13T10:30:06.861371124Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22128-1","title":"Security update for libxls","description":"This update for libxls fixes the following issues:\n\nChanges in libxls:\n\nUpdate to release 1.6.4:\n\n  * Fix use of uninitialized memory in OLE parsing\n    [boo#1267687, CVE-2026-26825]\n  * Fix use of uninitialized memory in read_MSAT\n    [boo#1267608, CVE-2026-26824]\n  * Fix use of uninitialized memory in xls_parseWorkBook\n  * Fix out-of-bounds reads in the formula dumper\n  * Handle allocation failures in OLE, workbook and string code\n  * Read SummaryInformation streams at their real size\n  * Keep full precision when converting numeric cells to strings\n  * Fix \"creation of UTF-8 locale failed\" in xls2csv\n\nUpdate to release 1.6.3:\n\n  * Fix style record size check on big-endian systems\n  * Fix header include in C++ mode\n  * Fix buffer overflows when parsing style records\n  * Fix infinite loop with self-referencing sectors\n","status":"published","published":"2026-10-19T15:30:18Z","modified":"2026-10-20T19:15:04.886320219Z","updated_at":"2026-11-02T16:58:42.426393Z"}]}}