CVE-2026-26824

MEDIUM

libxls <= 1.6.3 - Use-After-Free in OLE Container Parser

Title source: llm

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

References (1)

Core 1

Core References

https://github.com/libxls/libxls/issues/155

Scores

CVSS v3 6.5

EPSS 0.0022

EPSS Percentile 12.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-457

Status published

Products (1)

libxls_project/libxls < 1.6.3

Published Jun 03, 2026

Tracked Since Jun 04, 2026