CVE-2026-79592 libxls - Out of Bounds Read

libxls 1.6.3 contains an out-of-bounds read caused by insufficient validation of file-controlled OLE summary offsets in xls_dumpSummary() function, letting attackers read memory out of bounds, exploit requires crafted file input.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to the latest version of libxls.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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