r-cran-readxl: A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files
CVE-2026-26825 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-26825, released June 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libxls · opensuse-leap 16.0 | 1.6.4-bp160.1.1 | OPENSUSE-SU-2026:22128-1 | Nov 7, 2026 |
| r-cran-readxl · Debian 14 | 1.6.0-1 | DEBIAN-CVE-2026-26825 | Jun 3, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.