r-cran-readxl: libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser
CVE-2026-26824 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-26824, released June 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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
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-2026-26824 | Jun 3, 2026 |
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