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.
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Affected Vendors & Products
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References
| Link | Providers |
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| https://github.com/libxls/libxls/issues/156 |
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History
Wed, 03 Jun 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Uninitialized Memory Use in libxls 1.6.3 Leads to Undefined Behavior and Possible Information Disclosure | |
| Weaknesses | CWE-758 |
Wed, 03 Jun 2026 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
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MITRE
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-06-03T20:01:10.984Z
Reserved: 2026-02-16T00:00:00.000Z
Link: CVE-2026-26825
Vulnrichment
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NVD
Status : Received
Published: 2026-06-03T20:16:18.797
Modified: 2026-06-03T20:16:18.797
Link: CVE-2026-26825
Redhat
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OpenCVE Enrichment
Updated: 2026-06-03T21:30:32Z