What is CVE-2026-26825?

CVE-2026-26825 is a medium-severity vulnerability in Libxls_project Libxls, classified under Use of Uninitialized Resource. CVSS score: 5.3/10. Published 2026-06-03.

How severe is CVE-2026-26825?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Libxls_project Libxls

CVE-2026-26825

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). T…

EPSS: 0.000 (6.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Libxls_project Libxls — versions 1.6.3
N/a — versions n/a

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

cve@mitre.org (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2026-26825?: CVE-2026-26825 is a medium-severity vulnerability in Libxls_project Libxls, classified under Use of Uninitialized Resource. CVSS score: 5.3/10. Published 2026-06-03.
How severe is CVE-2026-26825?: Medium severity. CVSS v3 base score is 5.3 out of 10.