SEPTEMBER 17, 2026
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Case File

CVE-2026-79591

HIGH · CVSS 7.8 EPSS 0.13% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-10 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

A heap-buffer-overflow and use-after-free vulnerability in the xls_getCSS() function of libxls 1.6.3 arises from inadequate validation of a file-controlled font index, potentially allowing attackers to execute arbitrary code. Organizations utilizing libxls for parsing Excel files should prioritize patching this vulnerability to mitigate risks associated with maliciously crafted files.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-79591
Severity
HIGH
CVSS
7.8
EPSS
0.13%

Original NVD 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.