VULNERABILITY INTELLIGENCE

CVE-2026-26825

CVSS score5.3 MEDIUM
EPSS probability0.24%
CISA KEVNot currently listed
Published2026-06-03
Last modified2026-09-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Weakness classification

  • nvd@nist.gov: CWE-908
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-908

Primary references