CVE-2026-79591
HIGH
7.8
CVSS Score
Published: September 10, 2026 at 12:00 AM UTC
Updated: September 22, 2026 at 08:11 PM UTC
1 product affected across 1 vendorLibxls
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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
PoC
Description
A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (2)
Source: cverecord
https://github.com/libxls/libxls/issues/161SSVC — Action Prioritization
SSVCPoCNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.8HIGHCISA-ADP
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusDEFERRED
CWE
CWE-122
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