CVE-2026-34085CWE-193

fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a…

Medium · published March 25, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
8.1
In the wild
Unconfirmed
What it is

fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a crash or code execution. This is in FcFontCapabilities in fcfreetype.c.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00189 · 8.1th percentile
Weakness
CWE-193 · Off-by-one Error
Published
2026-03-25T16:54Z
EPSS history
Timeline
  • 25 MAR 16:54Z
    fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a…
    cvelistv5