CVE-2026-26824

6.5 mediumEPSS 0.3%

Medium (6.5) in libxls project libxls. EPSS 0.3% chance of exploitation in the next 30 days.

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

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
CWE: CWE-457
Published: 2026-06-03
Modified: 2026-09-23
Record from: the NVD, synced 2026-10-19

Affected

libxls_project:libxls

References

https://github.com/libxls/libxls/commit/9adebc9b6d60db21f25ddc898e8760eeb69d6529
https://github.com/libxls/libxls/issues/153
https://github.com/libxls/libxls/issues/155
https://github.com/libxls/libxls/issues/155

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