libxls 1.6.3 xls_dumpSummary out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, was found in libxls 1.6.3. The impacted element is the function xls_dumpSummary. The manipulation results in out-of-bounds. This vulnerability is reported as CVE-2026-79592. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in libxls 1.6.3. Affected is the function xls_dumpSummary. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. CVE summarizes:

An out-of-bounds read vulnerability exists in the xls_dumpSummary() function of libxls 1.6.3 due to insufficient validation of file-controlled OLE summary offsets.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-79592 since 08/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• libxls

Version

• 1.6.3

Website

• Product: https://github.com/libxls/libxls/

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