CVE-2026-110605 libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line
Attackers can crash applications using libschrift by providing a crafted TrueType font with a zero unitsPerEm value, causing a divide-by-zero error.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110605?
CVE-2026-110605 is a medium-severity denial of service vulnerability in tomolt libschrift, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
libschrift through 0.10.2 contains a divide by zero vulnerability that allows attackers to crash applications by supplying a font with unitsPerEm of 0 in the head table. Attackers can provide a crafted TrueType font whose NaN glyph coordinates bypass clip_points(), causing an out-of-bounds raster read in draw_line() during sft_render() and crashing the process.
Weakness: CWE-369
Which versions are affected by CVE-2026-110605?
How do I fix CVE-2026-110605?
No fix has been published for CVE-2026-110605 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-110605 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110605 exists.
Sources
Also known as GHSA-h8w2-cf8p-7p38.