CVE-2026-26825: n/a
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.
AI Analysis
Technical Summary
This vulnerability in libxls 1.6.3 involves use of uninitialized memory during XLS file parsing, specifically reachable through the xls_parseWorkBook() function. The uninitialized memory stems from the OLE layer's ole2_read component. Detection is possible with MemorySanitizer (MSAN). The issue may lead to undefined behavior, incorrect parsing outcomes, or potential information disclosure. No patch or remediation guidance is currently provided, and no exploits are known.
Potential Impact
The vulnerability can result in undefined behavior or incorrect parsing of XLS files, which may cause application instability or errors. There is also a potential for information disclosure due to use of uninitialized memory. However, no confirmed exploitation or active attacks have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when processing untrusted XLS files with libxls 1.6.3. Monitoring vendor channels for updates is recommended.
CVE-2026-26825: n/a
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in libxls 1.6.3 involves use of uninitialized memory during XLS file parsing, specifically reachable through the xls_parseWorkBook() function. The uninitialized memory stems from the OLE layer's ole2_read component. Detection is possible with MemorySanitizer (MSAN). The issue may lead to undefined behavior, incorrect parsing outcomes, or potential information disclosure. No patch or remediation guidance is currently provided, and no exploits are known.
Potential Impact
The vulnerability can result in undefined behavior or incorrect parsing of XLS files, which may cause application instability or errors. There is also a potential for information disclosure due to use of uninitialized memory. However, no confirmed exploitation or active attacks have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when processing untrusted XLS files with libxls 1.6.3. Monitoring vendor channels for updates is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-02-16T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a208c1fe29bf47b50e773ef
Added to database: 6/3/2026, 8:18:39 PM
Last enriched: 6/3/2026, 8:33:52 PM
Last updated: 6/4/2026, 4:49:24 AM
Views: 9
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