CVE-2026-110605
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.
Does this matter?
Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 6.8 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.20% probability · 10th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-369
- Source
- disclosure@vulncheck.com
EPSS moved from 0.2% on 15 October 2026 to 0.2% on 26 October 2026.
References
- https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L1422-L1503
- https://github.com/tomolt/libschrift/blob/v0.10.2/schrift.c#L542
- https://github.com/tomolt/libschrift/issues/46
- https://hackmd.io/@haind-pwn/libschrift-unitsperem-zero-oob
- https://www.vulncheck.com/advisories/libschrift-through-0.10.2-divide-by-zero-via-unitsperem-in-draw-line
- https://github.com/tomolt/libschrift/issues/46
- https://hackmd.io/@haind-pwn/libschrift-unitsperem-zero-oob
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.