CVE-2026-110605: medium-severity vulnerability in tomolt libschrift
libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.3%
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
tomolt · libschriftReferences
https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L1422-L1503https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L542https://github.com/tomolt/libschrift/issues/46https://hackmd.io/@haind-pwn/libschrift-unitsperem-zero-oobhttps://www.vulncheck.com/advisories/libschrift-through-0.10.2-divide-by-zero-via-unitsperem-in-draw-line