CVE-2026-26824CWE-457

CVE-2026-26824

Medium · published June 4, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
38.4
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00453 · 38.4th percentile
Weakness
CWE-457 · Use of Uninitialized Variable
Published
2026-06-04T00:16Z
Affected products (1)
ProductVersionsFixed in
libxls_project/libxls≤ 1.6.3—
References (4)
https://github.com/libxls/libxls/commit/9adebc9b6d60db21f25ddc898e8760eeb69d6529 · [email protected]https://github.com/libxls/libxls/issues/153 · [email protected]https://github.com/libxls/libxls/issues/155 · [email protected]https://github.com/libxls/libxls/issues/155 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 JUN 00:00Z
    libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser
    cvelistv5