Medium 6.5Published Jun 3, 2026

CVE-2026-26824libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser.

Updated under an hour ago (2026-10-19 06:30 UTC)

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It affects libxls_project libxls. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness (CWE): CWE-457
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Sep 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

libxls_project libxls libxls_project:libxls	through 1.6.3	NVD

References

https://github.com/libxls/libxls/commit/9adebc9b6d60db21f25ddc898e8760eeb69d6529
https://github.com/libxls/libxls/issues/153
https://github.com/libxls/libxls/issues/155exploit, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.