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VULNERABILITIES

CVE-2026-26825 Details

Description

A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA: CISA-ADPCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/libxls/libxls/commit/9adf88f4e3b304e397f70ac189e70776edb6d5a3 [email protected]
https://github.com/libxls/libxls/issues/153 [email protected]
https://github.com/libxls/libxls/issues/156 [email protected]ExploitIssue Tracking

Weakness Enumeration

CWE-IDCWE NameSource
CWE-908Use of Uninitialized Resource[email protected]
CWE-908Use of Uninitialized ResourceCISA-ADP

Affected Products

ProductVersions
libxls project libxls
1.6.3

CPE

  • cpe:2.3:a:libxls_project:libxls:1.6.3:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

7 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-26825
NVD Published Date:
Jun 3, 2026
NVD Last Modified:
Sep 23, 2026
Source:
[email protected]
CVE-2026-26825 Details - Not Deferred