CVE-2026-79591CWE-122

CVE-2026-79591

High · published September 11, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
6.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00174 · 6.5th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-09-11T01:17Z
References (3)
https://github.com/libxls/libxls/issues/161 · [email protected]https://github.com/libxls/libxls/pull/164/changes/902c8f9b13710c3a13b6232fb86626c5c729402c · [email protected]https://github.com/libxls/libxls/issues/161 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 12 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 10 SEP 00:00Z
    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…
    cvelistv5