CVE-2026-26824

State: Published
Severity: 6.5 Medium
Published: Jun 3, 2026
Updated: Sep 23, 2026
Reserved: Feb 16, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L	CISA-ADP

Weaknesses

CWE-457 Use of Uninitialized Variable

Affected Products

Product	Versions
n/an/a	n/aAffected

References

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.